As nouns the difference between firmness and perverseness
is that firmness is the state of being firm; strength; permanence; stability; hardness; resolution while perverseness is the quality of being perverse; obstinacy or doggedness.
firmness
English
Noun
The state of being firm; strength; permanence; stability; hardness; resolution.
References
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perverseness
English
Noun
The quality of being perverse; obstinacy or doggedness