A person regarded as being disagreeably egotistical and self-assured.
[Alteration by folk etymology from Middle Dutch wijsseggher, soothsayer, translation of Middle High German wīssage, from Old High German wīssago, seer, alteration (influenced by forasago, sayer beforehand, prophet) of wīzago, from wīzag, knowledgeable; see weid- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.