Perjurer
/ˈpɜːrdʒərər/
Definition 1 of 1
Pro Tip 1/3Court Context
The term is mainly used in legal situations where truth-telling is a legal duty. 
The witness became a perjurer when he lied under oath.
Pro Tip 2/3Serious Consequence
Calling someone a perjurer implies serious legal ramifications and is not taken lightly. 
If found to be a perjurer, she could face prison time.
Pro Tip 3/3Moral Weight
The term 'perjurer' carries a heavy moral stigma as it involves breaking a promise to tell the truth. 
He was not only a perjurer but also lost the community's trust.