firmness

As a noun firmness

is the state of being firm; strength; permanence; stability; hardness; resolution.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between firmness and resistance

is that firmness is the state of being firm; strength; permanence; stability; hardness; resolution while resistance is resistance (all meanings).

As nouns the difference between persistence and firmness

is that persistence is the property of being persistent while firmness is the state of being firm; strength; permanence; stability; hardness; resolution.

As nouns the difference between firmness and stamina

is that firmness is the state of being firm; strength; permanence; stability; hardness; resolution while stamina is (uncountable|now considered singular) the energy and strength for continuing to do something over a long period of time; power of sustained exertion, or resistance to hardship, illness etc.

As nouns the difference between confident and firmness

is that confident is while firmness is the state of being firm; strength; permanence; stability; hardness; resolution.

As an adjective confident

is very sure of something; positive.

As nouns the difference between tightness and firmness

is that tightness is the quality or degree of being tight while firmness is the state of being firm; strength; permanence; stability; hardness; resolution.

Firmness is a related term of rectitude.

As nouns the difference between firmness and rectitude

is that firmness is the state of being firm; strength; permanence; stability; hardness; resolution while rectitude is straightness; the state or quality of having a constant direction and not being crooked or bent.

Immovability is a related term of firmness.

As nouns the difference between immovability and firmness

is that immovability is the state of being immovable while firmness is the state of being firm; strength; permanence; stability; hardness; resolution.

As nouns the difference between secureness and firmness

is that secureness is the quality or state of being secure, security while firmness is the state of being firm; strength; permanence; stability; hardness; resolution.

Firmness is a related term of truth.

As nouns the difference between firmness and truth

is that firmness is the state of being firm; strength; permanence; stability; hardness; resolution while truth is the state or quality of being true to someone or something.

As a verb truth is

(obsolete|transitive) to assert as true; to declare, to speak truthfully.