adjective
1.
Synonyms: ineffective 3, ineffectual, inefficacious
Antonyms: efficient
2.
incapable of the proper performance of duties
inefficient workmen
Synonyms: incapable, incompetent, inept, inexpert, unexpert, unskilled, unskillful, unworkmanlike
Related Word: careless, slipshod, slovenly; unfitted, unprepared, unqualified, untrained; unskilled, unskillful
Contrasted words: able, adept, capable, competent, expert, proficient, qualified, skilled, skillful, workmanlike
Antonyms: efficient