This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. the property of being taut

n. The state of being taut; tightness; tenseness.

n. lack of movement or room for movement

n. the physical condition of being stretched or strained

"There were marks of fatigue on his face, and that kind of tautness shown by a man driven to the edge of endurance, perhaps beyond."

immovableness    immovability   

hatchment    tensing    competition    meatiness    thousandth