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Similar to Indefinitely, but used in a different manner. Instead of meaning infinitely, like indefinitely, UnDefinitely means uncertain, or not positive in a decision or statement. The opposite of definitely.
"I'm definitely sure that's not a word." -Dude 1
"I'm UnDefinitely sure, check the dictionary." - Dude 2
"I'm UnDefinitely sure, check the dictionary." - Dude 2
by RiddleMeThis July 03, 2017