Curious

besynderlig

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

kuriøs

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

mærkværdig

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

nysgerrig

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