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"forbidden" is also used as a crossword clue. If that's what you saw, the answer is often banned (6 letters).
Definitions
excluded from use or mention
Used in a sentence
“This kind of immediate control structure we take to be characteristic of the tribe, and it leads to a rather rigid type of system in which 'every action not mandatory is forbidden'.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“taboo”9 letters
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