sly

[ slahy ]
/ slaɪ /
|||

adjective, sly·er, sly·est.

cunning or wily: sly as a fox.
stealthy, insidious, or secret.
playfully artful, mischievous, or roguish: sly humor.

Idioms

    on the sly, secretly; furtively: a tryst on the sly.

Origin of sly

1150–1200; Middle English sly, sley, from Old Norse slœgr “sly, cunning” (originally “able to strike, able to slay”); see slay

Related forms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sly

British Dictionary definitions for sly

sly

/ (slaɪ) /

adjective slyer, slyest, slier or sliest

crafty; artfula sly dodge
insidious; furtivea sly manner
playfully mischievous; roguishsly humour

noun

on the sly in a secretive manner

Derived Forms

slyly or slily, adverbslyness, noun

Word Origin for sly

C12: from Old Norse slǣgr clever, literally: able to strike, from slā to slay
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

Idioms and Phrases with sly

sly

see on the sly.


The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.