sly, cunning, crafty, wily, tricky, foxy, artful, slick mean attaining or seeking to attain one's ends by guileful or devious means. sly implies furtiveness, lack of candor, and skill in concealing one's …

She thought that by being sly, she could fool people. A cat can be a very sly animal.

If you describe someone as sly, you disapprove of them because they keep their feelings or intentions hidden and are clever at deceiving people.

Definition of sly adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Define sly. sly synonyms, sly pronunciation, sly translation, English dictionary definition of sly. adj. sli·er , sli·est also sly·er or sly·est 1. Clever or cunning, especially in the practice of deceit. 2. …

The adjective sly means Cunning, crafty, or deceitful in a subtle or sneaky manner.

sly (slī), adj., sly•er or sli•er, sly•est or sli•est, n. adj. cunning or wily: sly as a fox. stealthy, insidious, or secret. playfully artful, mischievous, or roguish: sly humor. n. on the sly, secretly; …

When you're sly, you're crafty, cunning, tricky, and wily. Being sly is being deceitful, though not in the worst way.

SLY definition: cunning or wily. See examples of sly used in a sentence.

on the sly informal : in a secret way They've been meeting each other on the sly. [= secretly]