Webster's English Dictionary

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sly

sly \'sli-\ \'sli-(-*)r\ \'sli--*st\ aj or sli.er also sly.er;  also 
   sli.est;  also sly.est [ME sli, fr. ON sloegr; akin to OE sle-an to strike 
   - mo]re at SLAY chiefly dial  1a: CANNY, SHREWD  1b: displaying cleverness 
   : INGENIOUS  2a: artfully cunning : CRAFTY  2b: SECRETIVE, FURTIVE  3: 
   lightly mischievous : ROGUISH MWILY, ARTFUL mean attaining one's ends by 
   devious means. SLY implies lack of candor, furtiveness, and skill in 
   concealing one's intentions and methods; CUNNING suggests the effective use 
   of sometimes limited intelligence in evading or circumventing; CRAFTY 
   implies clever cunning and subtlety of method; TRICKY may stress 
   unscrupulous cunning; FOXY suggests shrewd and wary craftiness; WILY 
   stresses astuteness in tricking or laying traps; ARTFUL suggests 
   insinuating or ingratiating craftiness : FURTIVELY  - sly.ly av SYN syn 
   SLY, CUNNING, CRAFTY, TRICKY, FOXY,