Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
snidely is an adverb meaning "with a sneer; in an uncomplimentary sneering manner". It carries one recorded sense.
with a sneer; in an uncomplimentary sneering manner
“`I don't believe in these customs,' he said sneeringly”
Definitions, synonyms and semantic relations for snidely come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.