27 insufficient synonyms include inadequate, not enough, too little, too few, too small, deficient, poor, scant, scanty, and scarce. Insufficient is an adjective, and its antonyms are sufficient and adequate. Here are some additional synonyms for "insufficient" with example sentences.
27 other ways to say insufficient.
His explanation was insufficient to convince me.
She felt that the compensation she received for the project was insufficient considering the workload.
The evidence was deemed insufficient for conviction.