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