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