Meaning

adjective affected by an impairment of normal physical or mental function

adjective feeling nausea; feeling about to vomit

adjective affected with madness or insanity

originInherited from Middle English *sikeren (attested only as sikeriez (“(it) trickles, (it) leaks, (it) oozes”)), from Old English sicerian (“to ooze, seep”), from Proto-West Germanic *sikarōn, from Proto-Germanic *sikarōną (“to trickle”), from Proto-Germanic *sīką (“slow running water”). Cognate with German Low German sickern (“to seep”), German sickern (“to seep, trickle”). Akin also to English…

Etymology from Wiktionary, CC BY-SA 3.0