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"restful" is also used as a crossword clue. If that's what you saw, the answer is often relaxing (8 letters).
Definitions
affording physical or mental rest
Word origin
From Middle English restful, restfulle, equivalent to rest + -ful.
Used in a sentence
“After a hard day, Sue found the beauty of the park especially restful.”
“'And are you trembling still, dear? Then let me take your hand; And I will lead you outward To a sweet and restful land.”
“A restful night's sleep mended his spirits.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Calm and soothing”7 letters
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