Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
uneffective is an adjective meaning "not producing an intended effect". It carries one recorded sense.
not producing an intended effect
“an ineffective teacher”
“ineffective legislation”
Definitions, synonyms and semantic relations for uneffective come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.