"inquisitive" in the adjective sense
1. inquisitive, speculative, questioning, wondering
showing curiosity
"if someone saw a man climbing a light post they might get inquisitive"
"raised a speculative eyebrow"
2. inquisitive
inquiring or appearing to inquire
"an inquiring look"
"the police are proverbially inquisitive"
Source: WordNet® (An amazing lexical database of English)
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