stiffness is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Noun (COUNTABLE AND UNCOUNTABLE)

rigidity or a measure of rigidity.
inflexibility or a measure of inflexibility.
inelegance; a lack of relaxedness.
• His stiffness hampered the conversation.

stiffness is a Scrabble valid word

stiffness

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

stiffness is an iScramble, QuickWords valid word

stiffness

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• STUFFINESS

Same letters minus one

• SNIFFEST
• STIFFENS