Synonyms of 'languish'
1 declineDictionary, waste away, fade away
He continues to languish in prison.
2 waste awayDictionary, suffer, rot
New products languish on the drawing board.
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If you flag or if your spirits flag, you begin to lose enthusiasm or energy.
His enthusiasm was in no way flagging.
If you long for something, you want it very much.
He longed for the good old days.
Thesaurus for languish from the Collins English Thesaurus
If someone languishes somewhere , they are forced to remain and suffer in an unpleasant situation.