What are the opposite words for sufficient?

Sufficient, meaning enough or adequate, has a few antonyms that refer to inadequacy or insufficiency. Insufficient is the most common antonym of sufficient, and it means insufficient or inadequate. Inadequate is another antonym that's similar, but it emphasizes incomplete or unsatisfactory rather than just not enough. Meager is another antonym that means lacking in quantity, especially when referring to limited resources or money. Scant, meager, and paltry are other antonyms that express a lack of sufficiency. Conversely, plentiful, abundant, and copious are antonyms that suggest plenty or more than enough, and are the opposite of insufficient or inadequate.

Antonym of the day

doth to a turn
abstain, avoid, bear.