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"restlessness" is also used as a crossword clue. If that's what you saw, the answer is often discontent (10 letters).
Definitions
inability to rest or relax or be still
Word origin
From restless + -ness.
Used in a sentence
“She sat and fidgeted out of restlessness as she waited.”
“With nothing to occupy his attention, Mr Enniscorthy began to manifest an unhappy restlessness that increased until the play had been proceeding for some few minutes.”
“A feeling of restlessness and an urge to move in your arms, legs or torso is a state of hyperarousal and can keep you from a good night’s sleep, she said.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Inability to relax”12 letters
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