inefficient

adjectives

not producing desired results; wasteful
"an inefficient campaign against drugs"; "outdated and inefficient design and methods"
is derived from
antonym
is similar to
inefficient in use of time and effort and materials
"a clumsy and wasteful process"; "wasteful duplication of effort"; "uneconomical ebb and flow of power"
see also
not qualified or suited for a purpose
"an incompetent secret service"; "the filming was hopeless incompetent"
see also
not producing an intended effect
"an ineffective teacher"; "ineffective legislation"
lacking the ability or skill to perform effectively; inadequate
"an ineffective administration"; "inefficient workers"
is derived from