Curious

курио́зен

kuriózen

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

любозна́телен

ljuboznátelen

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

любопи́тен

ljubopíten

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

стра́нен

stránen

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