the.com/imposter

means Someone pretending to be who they're not, usually to deceive others — or, in the modern psychological sense, someone who feels like a fraud despite real evidence of their own competence.

from Comes through French imposteur from Late Latin impostor, 'one who imposes upon or deceives,' rooted in the Latin verb imponere — literally 'to place upon' (in- 'upon' + ponere 'to put'), the sense evolving from 'imposing a burden or tax' to 'imposing a deception on someone.' The spelling with 'er' instead of 'or' is simply the common English habit of reshaping Latin agent-nouns to look native.