Synonyms for hardness | hardness synonyms

stiffness (noun)

Synonyms:

rigidity, inflexibility, rigidness.

ruggedness (noun)

Synonyms:

toughness, firmness, strength, durability, solidity, grit, constancy.

severity (noun)

Synonyms:

harshness, callousness, sternness.

strictness (noun)

Synonyms:

stringency, rigor, rigour.

bitterness,