Synonyms for ADEQUATE: decent, satisfactory, good, fine, acceptable, OK, serviceable, useful; Antonyms of ADEQUATE: insufficient, inadequate, lacking, unsatisfactory ... Agreeableness […] ought to be exact, and adequate both to age, person and condition, avoiding extremities on both sides, being neither too much out, nor in the fashions. Find the meaning, pronunciation, and usage of the adjective adequate, which means sufficient to satisfy a requirement or meet a need. Compare with related words such as sufficient, satisfactory, and inadequate. The meaning of ADEQUATE is sufficient for a specific need or requirement; also : good enough : of a quality that is good or acceptable : of a quality that is acceptable but not better than acceptable.