Origin: Latin suffix -ous
Treacherous has 3 different meanings across 1 category:
dangerously unstable and unpredictable
"treacherous winding roads"
"an unreliable trestle"
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
"Punic faith"
"the perfidious Judas"
"the fiercest and most treacherous of foes"
"treacherous intrigues"
Exhibiting treachery.