Crossly is an adverb. The adverb is an invariable part of the sentence that can change, explain or simplify a verb or another adverb.

What type of word is crossly?

in an annoyed or angry way: "He's so unreliable!" she said crossly. "Of course not," he denied crossly.

What is crossly?

Definitions of crossly. adverb. in an ill-natured manner. “she looked at her husband crossly” synonyms: grouchily, grumpily.