justifier
Noun
Meaning
One who justifies; one who vindicates, supports, defends, or absolves.
Source: Webster's dictionarySynonyms
Antonyms
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Examples
an apologist for capital punishment
At least sometimes, the justifier of a belief is another belief.
If a belief is justified, then it has at least one justifier.
Regardless, to be justified, a belief has to have a justifier.
Thus, such a belief is unjustified because the justifier on which it depends is itself not justified.