偽金[nisegane] counterfeit money
偽首[nisekubi] falsified severed head
偽り[itsuwari] lie
偽り語る[itsuwarikataru] to speak falsely
偽り者[itsuwarimono] impostor

偽り誓う[itsuwarichikau] to swear falsely
偽る[itsuwaru] to lie
偽悪[giaku] pretense of evil
偽印[giin] forged seal

嘘っぱち[usoppachi] downright lie
嘘っ八百[usoppappyaku] full of lies
嘘でかためる[usodekatameru] to fabricate a web of lies
嘘を付く[usowotsuku] to tell a lie
嘘字[usoji] incorrect character

嘘付き[usotsuki] liar (sometimes said with not much seriousness)
嘘八百[usohappyaku] full of lies
大嘘[oouso] big lie
嘘ぶく[usobuku] to exaggerate