1. Highly excited with strong emotion or frustration; frenzied: frantic with worry.
2. Characterized by rapid and disordered or nervous activity: made a frantic last-minute search for the lost key.
3. Archaic Mentally deranged.
[Middle English frantik, from Old French frenetique, from Latin phrenēticus; see FRENETIC.]
franti·cal·ly, frantic·ly adv.
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.