Curious

допи́тливий

dopýtlyvyj

(tending to ask questions, or to want to explore or investigate — see also inquisitive)

знаттєлю́бний

znattjeljúbnyj

(tending to ask questions, or to want to explore or investigate — see also inquisitive)

курйо́зний

kurjóznyj

(leading one to ask questions about; somewhat odd, out of the ordinary, or unusual)

ціка́вий

cikávyj

(tending to ask questions, or to want to explore or investigate — see also inquisitive)