Neutral:
* Untruthful: This is a straightforward and relatively polite option.
* Misinformed: This suggests the person is mistaken rather than intentionally deceitful.
* Inaccurate: Similar to "misinformed," but emphasizes the wrongness of the information.
* Fabricator: This is a more formal term, implying the person makes up stories.
Less Neutral:
* Stretch the truth: This is a common euphemism that implies exaggerating or embellishing the truth.
* Exaggerate: Similar to "stretch the truth," but focuses on making things seem bigger than they are.
* Not entirely truthful: This implies that the person is partly lying but not fully dishonest.
* Lacking in veracity: This is a more formal and academic way of saying "untruthful."
More Critical:
* Deceptive: This emphasizes the intention to mislead.
* Dishonest: This is a direct and negative term.
* Fraudulent: This suggests the person is intentionally lying for personal gain.
* Con artist: This is a harsh term that implies someone is skilled at deceiving others.
Ultimately, the best euphemism for "liar" depends on the situation and the message you want to convey.
It's important to note that using euphemisms can sometimes obscure the truth or make the situation seem less serious.