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sly

 
 
pronunciation:
slaI
phrases:
on the sly
part of speech: adjective
inflections: slier, slyer, sliest, slyest
definition 1: devious or not to be trusted.
The guard had to be extra careful with the sly criminal.
synonyms:
crafty, cunning, tricky
similar words:
devious
definition 2: crafty in a funny way; full of mischief.
Her sly smile told me it was all a joke.
synonyms:
mischievous
phrase: on the sly
derivations: slyly (adv.), slyness (n.)