1. Eager to learn more: curious investigators; a trapdoor that made me curious.
2. Unduly inquisitive; prying: a curious neighbor always looking over the fence.
3. Arousing interest because of novelty or strangeness: a curious fact.
a. Accomplished with skill or ingenuity.
b. Extremely careful; scrupulous or fastidious.
[Middle English, from Old French curios, from Latin cūriōsus, careful, inquisitive, from cūra, care; see CURE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.