goof (gf) Informal
a. A playful, silly, or outlandish person.
b. An incompetent, foolish, or stupid person.
2. A careless mistake; a slip.
v. goofed, goof·ing, goofs
1. To make a silly mistake; blunder: goofed up by turning right instead of left.
2. To waste or kill time: goofed around at the mall.
3. To tease or make fun of someone: goofed on her younger brother.
To spoil, as through clumsiness; bungle. Usually used with up: goof up a job.
[Possibly alteration of dialectal goff, fool, from obsolete French goffe, stupid.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.