Synonyms of improficient

1 Syllable

slack, weak

2 Syllables

inept, faulty, slipshod, sloppy, feeble, unfit

3 Syllables

untrained, inexpert, unskilled, half-baked, unskillful, prodigal, careless, slovenly

4 Syllables

unprepared, unqualified, improvident, extravagant, incompetent, ineffectual, incapable, inefficient

5 Syllables

unworkmanlike, disorganized, ineffective, inefficacious