(1):

(a.) Exciting attention or inquiry; awakening surprise; inviting and rewarding inquisitiveness; not simple or plain; strange; rare.

(2):

(a.) Careful or anxious to learn; eager for knowledge; given to research or inquiry; habitually inquisitive; prying; - sometimes with after or of.

(3):

(a.) Exhibiting care or nicety; artfully constructed; elaborate; wrought with elegance or skill.

(4):

(a.) Difficult to please or satisfy; solicitous to be correct; careful; scrupulous; nice; exact.