adverb. in a way that challenges or defies someone. 'Do you have a reservation?' he enquired challengingly. to look challengingly at somebody.

Is challengingly an adverb?

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

What does easily breakable meaning?

adjective. easily broken, shattered, or damaged; delicate; brittle; frail: a fragile ceramic container; a very fragile alliance.