Dictionary.com

senile

[ see-nahyl, -nil, sen-ahyl ]
/ ˈsi naɪl, -nɪl, ˈsɛn aɪl /
Save This Word!

adjective
showing a decline or deterioration of physical strength or mental functioning, especially short-term memory and alertness, as a result of old age or disease.
of or belonging to old age or aged persons; gerontological; geriatric.
Physical Geography. (of topographical features) having been reduced by erosion to a featureless plain that stands everywhere at base level.Compare peneplain.
noun
a senile person.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can’t figure out _____ gave me this gift.

Origin of senile

1655–65; <Latin senīlis old, equivalent to sen(ex) old man (akin to senior) + -īlis-ile

OTHER WORDS FROM senile

un·se·nile, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use senile in a sentence

British Dictionary definitions for senile

senile
/ (ˈsiːnaɪl) /

adjective
of, relating to, or characteristic of old age
mentally or physically weak or infirm on account of old age
(of land forms or rivers) at an advanced stage in the cycle of erosionSee old (def. 18)

Derived forms of senile

senilely, adverbsenility (sɪˈnɪlɪtɪ), noun

Word Origin for senile

C17: from Latin senīlis, from senex an old man
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK