otiose vs ineffectual

otiose and ineffectual both are adjectives.

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

As adjectives, otiose and ineffectual are synonyms defined as:

Other synonyms of otiose include futile, meaningless, unavailing.

otiose (adjective)	ineffectual (adjective)
disinclined to work or exertion	not producing an intended effect
producing no result or effect	lacking in power or forcefulness
serving no useful purpose; having no excuse for being	producing no result or effect