different between mendaciousness vs mendaciously

English

mendacious +? -ness

mendaciousness (uncountable)

mendacious +? -ly

mendaciously (comparative more mendaciously, superlative most mendaciously)

In a lying or deceitful manner.
As a politician, he was very adept at speaking mendaciously in public.
I don't think I'm going to buy what she just told me. Her gestures, eye movements, and hesitancy in her tone raised some substantial red flags. Therefore, I have reason to believe she was giving an excuse mendaciously. If you could've witnessed this, you'd know it too!

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