listless
[adjective]
Synonyms: languid, apathetic, indifferent, indolent, lethargic, sluggish

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Antonyms: eager
Contrasted words: agog, anxious, avid, keen, alert, vigilant, watchful, energetic, lusty, vigorous, prompt, quick, ready
Related Words: careless, heedless, thoughtless

[TahlilGaran] English Synonym Dictionary ▲

list‧less /ˈlɪstləs/ adjective
[Date: 1400-1500; Origin: list 'pleasure, desire' (13-19 centuries) (from Old English lystan 'to please, wish') + -less]
feeling tired and not interested in things:
The heat was making me listless.
—listlessly adverb
—listlessness noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲