Serving to disaffirm or tending to reverse a previous affirmation or decision.
From disaffirm + -ative (suffix forming adjectives meaning 'tending to'). A relatively rare legal term that combines the verb disaffirm with the adjectival suffix.
Disaffirmative is one of those wonderfully specific legal adjectives that describes something that cancels out or reverses—it's the linguistic equivalent of 'undo' as an adjective, though lawyers don't use it as often as simpler terms like 'reversing.'
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