Choose the perfect synonym or antonym for the word

If

A word used to introduce a condition or a possibility

Synonyms:

I can't tell if he's messing around or legitimately annoyed.Ned worked quickly to set if free.Or, if he did it meant the loss of Hortense.

Old English gif meaning if, whether, in case that, from Proto-Germanic *jabai and *ja, meaning and or also.

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