inefficient vs ineffectual

inefficient and ineffectual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inefficient	No	Yes	No	No
ineffectual	No	Yes	No	No

inefficient (adjective)	ineffectual (adjective)
not producing desired results; wasteful	not producing an intended effect
lacking the ability or skill to perform effectively; inadequate	lacking in power or forcefulness
	producing no result or effect