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