1. Extremely pleasing or successful: a fabulous vacation.
2. Barely credible; astonishing: the fabulous endurance of a marathon runner.
a. Of the nature of a fable or myth; legendary.
b. Told of or celebrated in fables or legends.
[Middle English, mythical, from Old French fabuleux, from Latin fābulōsus, from fābula, fable; see FABLE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.