सुस्त (sust)

adjective An everyday adjective describing sluggishness -- used for a person's low energy or mood, and just as often for a slow market, slow business, or a sluggish machine/internet connection.
Sense 1 : lethargic, sluggish (of a person)
adjective
Synonyms: आलसी (aalsii), निढाल (nidhaal, drained/limp), ढीला (dhiilaa, colloquial)
Frequency: high
Cultural Note: Delhi's muggy pre-monsoon afternoons are the classic setting for this word -- you'll hear लोग सुस्त हो जाते हैं (log sust ho jaate hain, 'people get sluggish') as an explanation for why nothing gets done between 2 and 5 pm. It pairs naturally with होना (honaa) and लगना (lagnaa), as in तबीयत सुस्त लग रही है (tabiiyat sust lag rahii hai, 'I'm feeling low/off').
Common Mistakes: 1) सुस्त (sust) describes a temporary or habitual lack of energy, not moral laziness -- for someone who habitually avoids work, आलसी (aalsii) is often the sharper word. 2) Learners often reach for थका हुआ (thakaa huaa, tired) when they mean सुस्त (sust) -- थका हुआ (thakaa huaa) is tiredness from exertion, while सुस्त (sust) is a general dullness of mood or body that may have no clear cause, like feeling groggy on a humid afternoon.
Sample Sentences:
आज मौसम की वजह से मैं बहुत सुस्त महसूस कर रहा हूँ। Because of the weather today, I'm feeling really lethargic.
(aaj mausam kii vajah se main bahut sust mahsoos kar rahaa hoon।)
Register: Casual -- Mood: Indicative -- Aspect: Continuous -- Tense: Present -- Voice: Active
दोपहर की गर्मी में लोग सुस्त हो जाते हैं। People get sluggish in the afternoon heat.
(dopahar kii garmii men log sust ho jaate hain।)
Register: Neutral -- Mood: Indicative -- Aspect: Habitual -- Tense: Present -- Voice: Active
मेरी तबीयत सुस्त लग रही है, आज दफ्तर नहीं जाऊँगा। I'm feeling a bit off, I won't go to office today.
(merii tabiiyat sust lag rahii hai, aaj daphtar nahiin jaaoongaa।)
Register: Casual -- Mood: Indicative -- Aspect: Continuous -- Tense: Present -- Voice: Active
कल रात ठीक से नींद न आने के कारण वह पूरे दिन सुस्त रहा। Since he didn't sleep well last night, he stayed lethargic the whole day.
(kal raat thiik se niind n aane ke kaaran vah poore din sust rahaa।)
Register: Neutral -- Mood: Indicative -- Aspect: Perfective -- Tense: Past -- Voice: Active
इतना सुस्त मत बनो, थोड़ा उठो और काम करो। Don't be so lazy, get up and do some work.
(itnaa sust mat bano, thodaa utho aur kaam karo।)
Register: Casual -- Mood: Imperative -- Voice: Active
अगर वह इतना सुस्त न होता तो अब तक अपना काम पूरा कर चुका होता। If he weren't so lethargic, he would have finished his work by now.
(agar vah itnaa sust n hotaa to ab tak apnaa kaam pooraa kar chukaa hotaa।)
Register: Neutral -- Mood: Counterfactual -- Aspect: Perfective -- Voice: Active
डॉक्टर ने कहा कि अगर आप हमेशा सुस्त महसूस करें तो जाँच करवा लें। The doctor said that if you always feel lethargic, you should get a check-up done.
(doktar ne kahaa ki agar aap hameshaa sust mahsoos karen to jaanch karvaa len।)
Register: Formal -- Mood: Subjunctive -- Tense: Present -- Voice: Active
शायद वह सुस्त हो, इसलिए आज जल्दी उठकर तैयार नहीं हुआ। Maybe he was feeling lethargic, that's why he wasn't ready after getting up early today.
(shaayad vah sust ho, islie aaj jaldii uthkar taiyaar nahiin huaa।)
Register: Neutral -- Mood: Subjunctive -- Tense: Present -- Voice: Active
उमस भरी दोपहरों में मेरी सुस्ती इतनी बढ़ जाती है कि कुछ भी करने का मन नहीं करता। On muggy afternoons my sluggishness increases so much that I don't feel like doing anything at all.
(umas bharii dopahron men merii sustii itnii badh jaatii hai ki kuchh bhii karne kaa man nahiin kartaa।)
Register: Casual -- Mood: Indicative -- Aspect: Habitual -- Tense: Present -- Voice: Active
बच्चे को बुखार के बाद कई दिनों तक सुस्त देखा गया। The child was seen to be lethargic for several days after the fever.
(bachche ko bukhaar ke baad kaii dinon tak sust dekhaa gayaa।)
Register: Formal -- Mood: Indicative -- Aspect: Perfective -- Tense: Past -- Voice: Passive
क्या तुम आजकल कुछ सुस्त हो? पहले जैसी फुर्ती नहीं दिखती। Are you feeling a bit lethargic these days? You don't seem as energetic as before.
(kyaa tum aajkal kuchh sust ho? pahle jaisii phurtii nahiin dikhtii।)
Register: Casual -- Mood: Indicative -- Tense: Present -- Voice: Active
Sense 2 : slow, dull (of markets, business, machines, pace)
adjective
Synonyms: मंदा (mandaa, of markets/business), धीमा (dhiimaa, of speed/pace)
Frequency: high
Cultural Note: Shopkeepers use it constantly about trade: बाज़ार सुस्त है (baazaar sust hai, 'the market is slack/dull') is a stock phrase you'll hear during off-season lulls, echoing the same core idea of low energy applied to commerce rather than a person.
Common Mistakes: 1) For internet or a slow-loading computer, सुस्त (sust) is very natural in casual speech -- e.g. इंटरनेट सुस्त है (intarnet sust hai, 'the internet is slow') -- learners often default to धीमा (dhiimaa) only, but सुस्त (sust) is equally common and sounds more colloquial.
Sample Sentences:
आज बाज़ार बहुत सुस्त है। The market is very dull today.
(aaj baazaar bahut sust hai।)
Register: Casual -- Mood: Indicative -- Tense: Present -- Voice: Active
बरसात के मौसम में कपड़ों का धंधा सुस्त पड़ जाता है। During the monsoon season, the clothing business turns sluggish.
(barsaat ke mausam men kapdon kaa dhandhaa sust pad jaataa hai।)
Register: Casual -- Mood: Indicative -- Aspect: Habitual -- Tense: Present -- Voice: Active
पिछले महीने शेयर बाज़ार बहुत सुस्त रहा। Last month the stock market remained quite sluggish.
(pichhle mahiine sheyar baazaar bahut sust rahaa।)
Register: Neutral -- Mood: Indicative -- Aspect: Perfective -- Tense: Past -- Voice: Active
अगर ब्याज दरें बढ़ीं, तो रियल एस्टेट बाज़ार और सुस्त हो जाएगा। If interest rates rise, the real estate market will become even more sluggish.
(agar byaaj daren badhiin, to riyal estet baazaar aur sust ho jaaegaa।)
Register: Formal -- Mood: Indicative -- Tense: Future -- Voice: Active
यह पुरानी मशीन बहुत सुस्त हो गई है, नई ले आओ। This old machine has become very sluggish, bring a new one.
(yah puraanii mashiin bahut sust ho gaii hai, naii le aao।)
Register: Casual -- Mood: Indicative -- Aspect: Perfective -- Tense: Present -- Voice: Active
त्योहारों के बाद बाज़ार सुस्त हो जाता है। The market goes dull after the festivals.
(tyohaaron ke baad baazaar sust ho jaataa hai।)
Register: Casual -- Mood: Indicative -- Aspect: Habitual -- Tense: Present -- Voice: Active
अर्थव्यवस्था की सुस्त रफ़्तार पर विशेषज्ञ चिंतित हैं। Experts are worried about the sluggish pace of the economy.
(arthavyvasthaa kii sust raftaar par visheshagy chintit hain।)
Register: Formal -- Mood: Indicative -- Tense: Present -- Voice: Active
काश इंटरनेट इतना सुस्त न होता, तो काम जल्दी हो जाता। If only the internet wasn't so sluggish, the work would have gotten done quickly.
(kaash intarnet itnaa sust n hotaa, to kaam jaldii ho jaataa।)
Register: Casual -- Mood: Counterfactual -- Aspect: Habitual -- Voice: Active
इस साल निर्यात व्यापार सुस्त बना हुआ है। The export trade has remained sluggish this year.
(is saal niryaat vyaapaar sust banaa huaa hai।)
Register: Formal -- Mood: Indicative -- Aspect: Perfective -- Tense: Present -- Voice: Active
दुकानदार बोला, बाज़ार सुस्त है, आज कुछ खास बिक्री नहीं हुई। The shopkeeper said, the market is slack, there wasn't much sales today.
(dukaandaar bolaa, baazaar sust hai, aaj kuchh khaas bikrii nahiin huii।)
Register: Casual -- Mood: Indicative -- Aspect: Perfective -- Tense: Past -- Voice: Active
Morphology
Adjective (variable)
(sg.m): सुस्त (sust)
(pl.m): सुस्ते (suste)
(sg.f): सुस्ती (sustii)
(pl.f): सुस्ती (sustii)