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Definition of interrogative : 1. A word used in asking questions; as, who? which? why?
2. Denoting a question; expressed in the form of a question; as, an interrogative sentence; an interrogative pronoun.

Synonyms:

doubtfulness, interrogative sentence, head, interrogatory, curious, doubt, dubiousness, asking, interrogative mood, question, query, inquiry, interrogation, enquiry, examination, motion

questioning (part of speech: adjective)

querying, inquisitive, questioning, quizzical, inquiring, probing, contemplative, challenging

Usage examples: