the.com/suspicion
the brain's smoke detector, screaming at toast and saving you from fires in equal measure
means A feeling that something is wrong, untrue, or dishonest, held without firm proof.
from From Latin suspicere, "to look up at" — and, by extension, to look at someone askance, with a sidelong eye. It's built from sub- ("up, from below") and specere ("to look"), the same specere that gives us spectacle, inspect, and spy. The notion travelled through Old French suspeçon before settling into English; somewhere along the way the literal upward glance soured into a wary, mistrustful squint.
survival rootsDistrust kept ancestors alive when wrong guesses meant death
legal weightReasonable suspicion lets police stop you, not arrest
paranoia lineClinical paranoia is suspicion untethered from any evidence
self-fulfillingSuspecting betrayal often provokes the very betrayal feared
trust costChronic suspicion measurably shortens lifespan and erodes health