ineffective

Fruitless is a synonym of ineffective.

As adjectives the difference between fruitless and ineffective

is that fruitless is useless; unproductive while ineffective is not having the desired effect; ineffectual.

As adjectives the difference between ineffective and nugatory

is that ineffective is not having the desired effect; ineffectual while nugatory is trivial, trifling or of little importance.

Ineffective is a related term of unavailing.

As adjectives the difference between ineffective and unavailing

is that ineffective is not having the desired effect; ineffectual while unavailing is useless, fruitless, futile.

Incapable is a synonym of ineffective.

As adjectives the difference between incapable and ineffective

is that incapable is not capable (of doing something); unable while ineffective is not having the desired effect; ineffectual.

As a noun incapable

is (dated) one who is morally or mentally weak or inefficient; an imbecile; a simpleton.

As adjectives the difference between ineffective and unaffected

is that ineffective is not having the desired effect; ineffectual while unaffected is not affected or changed.

As a noun unaffected is

someone not affected, as by a disease.

Noteffective is likely misspelled.

Noteffective has no English definition.

As an adjective ineffective is

not having the desired effect; ineffectual.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective ineffective is

not having the desired effect; ineffectual.

As adjectives the difference between ineffective and meager

is that ineffective is not having the desired effect; ineffectual while meager is having little flesh; lean; thin.

As a verb meager is

to make lean.

As adjectives the difference between inept and ineffective

is that inept is not able to do something; not proficient; displaying incompetence while ineffective is not having the desired effect; ineffectual.