1. Unimportant; trivial: "It's a Mickey Mouse operation compared to what goes on in Lyons or Paris" (Jack Higgins).
2. Intellectually unchallenging; simple: His Mickey Mouse assignments soon bored the students.
[After the cartoon character Mickey Mouse, created by Walt Disney.]
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.