'Skeptic' is Greek for 'one who looks carefully' — from PIE *spek- (to look). Kin to 'spectacle.'
A person inclined to question or doubt accepted opinions; a person who doubts the truth of a particular claim.
From Latin 'scepticus,' from Greek 'skeptikós' (inquiring, reflective, one who suspends judgment), from 'skeptesthai' (to look carefully, to examine, to consider), related to 'skopein' (to look at, to examine). The PIE root is *spek- (to observe, to look), also underlying Latin 'specere' (to look) → 'spectacle,' 'inspect,' 'expect,' 'species,' 'specimen,' 'aspect,' 'suspicion,' and 'mirror' (speculāre). The original Greek Skeptics (followers of Pyrrho of Elis, 4th–3rd century BCE) were not mere doubters
A skeptic is literally 'one who looks' — from the same PIE root *spek- (to observe) that gives 'spectacle' (a thing to look at), 'spectrum' (an appearance), 'inspect' (to look into), 'respect' (to look back at), 'prospect' (to look forward), 'suspect' (to look under), 'expect' (to look out for), and 'scope' (an instrument for looking). The ancient Skeptics didn't deny truth — they said 'we're still looking.' Pyrrho reportedly achieved such perfect equanimity