snide

Etymology

Probably from a dialectal variant of snithe (“sharp, cutting, cold”). See snithe (adjective). Alternatively, possibly a metathetic corruption of Middle English snythand (“piercing (the heart), cold, biting”, literally and figuratively). More at snithe (verb).

adj

1. Disparaging or derisive in an insinuative way.
   Don't make snide remarks to me.
   You write your snide bullshit from a dark room because that's what the angry do nowadays. I was nice to you, don't torture me for it. 2010, Aaron Sorkin, The Social Network, spoken by Erica Albright (Rooney Mara)
2. Tricky; deceptive; false; spurious; contemptible.
   He was a snide lawyer.
   I received a shipment of snide goods.
   I knew without studying them that the rings and the watch were snide, and the jewel a paste one; but they were damn fine counterfeits. 2002, Sarah Waters, Fingersmith, Virago Press (2005), page 19

noun

1. (countable) An underhanded, tricky person given to sharp practice; a sharper; a cheat.
2. (uncountable) Counterfeit money.