Meaning

noun a deliberate discourteous act (usually as an expression of anger or disapproval)

verb pay no attention to, disrespect

adjective (quantifier used with mass nouns) small in quantity or degree; not much or almost none or (with `a') at least some

originFrom Middle English slight (“bad, of poor quality, unimportant, trivial, slender, slim, smooth, level”), from Old English sliht (“smooth, level”), from Proto-Germanic *slihtaz (“slippery, flat, level, plain”), related to English slick. Cognate with Scots slicht (“bad, of poor quality”), West Frisian sljocht (“smooth, level, plain, simple”), Dutch slecht (“bad”), Low German slecht (“bad”), German…

Etymology from Wiktionary, CC BY-SA 3.0