curious

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Eager to learn more.
• adjective Unduly inquisitive; prying.
• adjective Arousing interest because of novelty or strangeness.
• adjective Accomplished with skill or ingenuity.
• adjective Extremely careful; scrupulous or fastidious.

from The Century Dictionary.

• Careful; nice; accurate; fastidious; precise; exacting; minute.
• Wrought with or requiring care and art; neat; elaborate; finished: as, a curious work.
• Exciting curiosity or surprise; awakening inquisitive interest; rare; singular; odd: as, a curious fact.
• Inquisitive; desirous of seeing or knowing; eager to learn; addicted to research or inquiry; sometimes, in a disparaging sense, prying: as, a man of a curious mind: followed by after, of, in, or about, or an infinitive.
• Synonyms. Strange, Surprising, etc. See wonderful. Curious, Inquisitive, Prying. Curious and inquisitive may be used in a good or a bad sense, but inquisitive is more often, and prying is only, found in the latter. Curious expresses only the desire to know; inquisitive, the effort to find out by inquiry; prying, the effort to find out secrets by looking and working in improper ways.
• To work curiously; elaborate.

from the GNU version of the Collaborative International Dictionary of English.

• adjective obsolete Difficult to please or satisfy; solicitous to be correct; careful; scrupulous; nice; exact.
• adjective Exhibiting care or nicety; artfully constructed; elaborate; wrought with elegance or skill.
• adjective Careful or anxious to learn; eager for knowledge; given to research or inquiry; habitually inquisitive; prying; -- sometimes with after or of.
• adjective Exciting attention or inquiry; awakening surprise; inviting and rewarding inquisitiveness; not simple or plain; strange; rare.
• adjective [Obs.] magic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective obsolete Fastidious, particular; demanding a high standard of excellence, difficult to satisfy.
• adjective Inquisitive; tending to ask questions, investigate, or explore.
• adjective Prompted by curiosity.
• adjective unusual; odd; out of the ordinary; bizarre

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective beyond or deviating from the usual or expected
• adjective having curiosity aroused; eagerly interested in learning more
• adjective eager to investigate and learn or learn more (sometimes about others' concerns)