Is Weak an Adverb?

weakly adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

Is weak an adjective or adverb?

adjective, weak·er, weak·est. not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor. lacking in bodily strength or healthy vigor, as from age or sickness; feeble; infirm: a weak old man; weak eyes.

Is Weakly an adverb of manner?

WEAKLY (adverb) definition and synonyms | Macmillan Dictionary.