Curious

besynnerlig

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

märklig

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

märkvärdig

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

nyfiken

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