late 14c., from slut + -ish. Related: Sluttishly; sluttishness.
c. 1400, "dirty, slovenly," from slut + -ish.
c. 1200, "skillful, clever, dexterous," from Old Norse sloegr "cunning, crafty, sly," from Proto-Germanic *slogis (source also of Low German slu "cunning, sly," German schlau), probably from base *slak- "to strike, hit" (see slay (v.)), with an original notion of "able to hit." Compare German verschlagen "cunning, crafty, sly," schlagfertig "quick-witted," literally "strike-ready," from schlagen "to strike." A non-pejorative use of the word lingered in northern English dialect until 20c. On the sly "in secret" is recorded from 1812. Sly-boots "a seeming Silly, but subtil Fellow" is in the 1700 "Dictionary of the Canting Crew."
c. 1200, from sly (adj.) + -ly (2).
in-,进入,使,-cre,增加,创造,词源同create,crescent.引申词义加薪。
词根词缀:in-入,向内 + -cre-生长 + -ment名词后缀
词根词缀:in-入,向内 + -cre-生长 + -ment名词后缀 + -al形容词后缀
词根词缀:in-入,向内 + -cre-生长(e略) + -escent形容词后缀,某种状态
in-,进入,使,crime,犯罪。引申词义使负罪,连累。