Also found in: Thesaurus, Medical.
1. Not meant or adapted for a given purpose; inappropriate: a solvent that is unfit for use on wood surfaces.
2. Below the required standard; unqualified: an unfit parent.
3. Not in good physical or mental health.
4. Biology Unable to survive or produce viable offspring in a particular environment.
tr.v. un·fit·ted, un·fit·ting, un·fits
To cause to be unsuited or unqualified: "Having run for president ... often unfits a man for lesser or more useful subsequent work" (Garry Wills).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
unsuitable: unused to and unfitted for any form of manual labour.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014