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"pretty" is also used as a crossword clue. If that's what you saw, the answer is often fetching (8 letters).
Definitions
Attractive; also fairly or quite.
Word origin
From Middle English prety, preti, praty, prati, from Old English prættiġ (“tricky, crafty, sly, cunning, wily, astute”), from Proto-West Germanic *prattug, from Proto-Germanic *prattugaz (“boastful, sly, slick, deceitful, tricky, cunning”), corresponding to prat (“trick”) + -y. Doublet of pratty.
Used in a sentence
“Hal Smith, manager of the Ferry Field theatre, Detroit, one of the largest and prettiest outskirt houses in town, played Metro's "Revelation" for three days last week”
“Some fans may have mistaken the album’s floatiness for aimlessness, but Mr. Mercer’s songs have never been sneakier, or prettier.”
“'Petit Posy' brassicas […] are a cross between kale and brussels sprouts, and are really very pretty with a mild, sweet taste.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Quite attractive or fairly”6 letters
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