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Proto-Indo-European *né

Proto-Indo-European *n̥-

Proto-Germanic *un-

Proto-West Germanic *un-

Old English un-

Middle English un-

English un-

Proto-Indo-European *h₁éǵʰ

Proto-Indo-European *-s

Proto-Indo-European *h₁éǵʰs

Proto-Italic *eks

Latin ex

Latin ex-

Proto-Indo-European *dʰeh₁-

Proto-Indo-European *dʰeh₁k-

Proto-Indo-European *-yéti

Proto-Indo-European *dʰh₁kyéti

Proto-Italic *θakjō

Proto-Italic *fakjō

Latin faciō

Latin efficiō

Proto-Indo-European *-wós

Proto-Indo-European *-iHwósder.

Latin -īvus

Latin effectīvusbor.

French effectifder.

English effective

English uneffective

From un- + effective.

uneffective (comparative more uneffective, superlative most uneffective)

Synonym of ineffective.
- 1942, Foreign Relations of the United States, United States: Department of State, page 419:
  The usual formal protest which I am making will be uneffective unless the Legation is prepared to take other measures such as the releasing of seized cargoes by our Navy.