What does "baseness" mean?

The quality or condition of being base.

Baseness

Common synonyms include: abjectness, abominability, abominableness, animalisticness, arrantness, atrociousness.

/ˈbeɪsnəs/ noun

noun ·Moderate ·High school level

Noun

1
The quality or condition of being base. countable, uncountable
2
unworthiness by virtue of lacking higher values wordnet
3
The quality of being unworthy to hold virtues or value. countable, uncountable

"Do you think me capable of such baseness?"

From base + -ness.