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"restless" is also used as a crossword clue. If that's what you saw, the answer is often antsy (5 letters).
Definitions
worried and uneasy
Word origin
From Middle English restles, restelees, from Old English ræstlēas, equivalent to rest + -less.
Used in a sentence
“The night before his wedding was a restless one.”
“He was a restless child.”
“She sat, restless and nervous, and tried to concentrate.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“fidgety”8 letters
02“Unable to relax”8 letters
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