in efficient

see definition of inefficient

as inincompetent

as inineffective/ineffectual
as ininefficient
as ininept
as inlame
as inunable
as inunfit
as inunprofessional
as inineffective
as inineffectual
as ininefficacious
as infeeble
as inhelpless

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Synonyms for in efficient

adj unskillful, unable

Antonyms for in efficient