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"casual" is also used as a crossword clue. If that's what you saw, the answer is often informal (8 letters).
Definitions
hasty and without attention to detail; not thorough
Word origin
From Middle French casuel, from Late Latin cāsuālis (“happening by chance”), from Latin cāsus (“event”) (English case), from cadere (“to fall”) (whence English cadence).
Used in a sentence
“They only had casual meetings.”
“casual breaks, in the general system”
“The purchase of donuts was just a casual expense.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not formal”6 letters
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