cu·ri·ous / ˈkyoŏrēəs/ • adj. 1. eager to know or learn something. ∎  expressing curiosity: a curious stare.2. strange; unusual: a curious sensation overwhelmed her.DERIVATIVES: cu·ri·ous·ly adv. cu·ri·ous·ness n.

curious
A. †careful, studious; †ingenious, skilled; eager to know or learn;

B. †carefully or skilfully wrought XIV; †interesting XVII; exciting attention by being strange or odd XVII. — OF. curios (mod. curieux) :- L. cūriōsus (only in subjective sense) careful, inquisitive, f. cūra care; see CURE, -IOUS.
So curiosity †carefulness, attention XIV; eager desire to know, inquisitiveness XVI.