1. (noun)must a necessary or essential thing Synonyms: moldiness, mustiness Antonyms: unessential, inessential
2. (noun)must grape juice before or during fermentation Synonyms: moldiness, mustiness Antonyms: inessential, unessential
3. (adj)mustiness, must, moldiness the quality of smelling or tasting old or stale or mouldy Synonyms: must, moldiness, mustiness Antonyms: inessential, unessential