adj. dot·ti·er, dot·ti·est
a. Mentally unbalanced; crazy.
b. Amusingly eccentric or unconventional.
c. Ridiculous or absurd: a dotty scheme.
2. Having a feeble or unsteady gait; shaky.
3. Obsessively infatuated or enamored.
[Probably alteration of Scots dottle, silly, from Middle English doten, to dote.]
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.