fee·ble (f??b?l)adj. fee·bler, fee·blest 1. a. Lacking bodily strength; weak: too feeble to climb the hill.b. Having little intensity or strength; faint: feeble light; a feeble voice.2. Having little capacity to withstand pressure or strain: the castle’s feeble defenses.3. a. Lacking vigor or effectiveness; inadequate: a feeble attempt to apologize.b. Showing little activity: a feeble housing market. See Synonyms at weak.[Middle English feble, from Old French, from Latin fl?bilis, lamentable, from fl?re, to weep.]fee?ble·ness n.fee?bly adv.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.