Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
overnice is an adjective meaning "excessively fastidious and easily disgusted". It carries one recorded sense.
excessively fastidious and easily disgusted
“too nice about his food to take to camp cooking”
“so squeamish he would only touch the toilet handle with his elbow”
Definitions, synonyms and semantic relations for overnice come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.