Not, un-, other than (غير)

Not, un-

To make an adjective negative, put غير(ghayr) in front of it, like English un- or not. غير and the adjective form an idafa, so the adjective is genitive in careful speech: غيرُ مهمٍّ.

Compare ليس, which negates a whole sentence: الطعام ليس لذيذا the food is not tasty and الطعام غير لذيذ say the same thing, but only غير can sit inside a phrase: قرار غير رسمي an unofficial decision.

Other than

Before a noun, غير means other than, except, close to إلا:

Do not confuse it with غيّر to change: the same letters, a different word.

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