The American form is 'bald-faced' — a lie told with no attempt at disguise, the face 'bald' of shame. British English sometimes prefers 'bare-faced.' 'Bold-faced' exists but traditionally means 'printed in bold type.'

Bald-faced = unashamed (US). Bare-faced = same (UK). Bold-faced = your font. Pick one of the first two for a lie.