One who, or that which, justifies (some belief or action).(noun)
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Use "justifier" in a sentence
"The consumer-justifier jabber in my head is in overdrive."
""Then you will be homeless and extremely well dressed," says the consumer-justifier jabber, who clearly views a life on the streets – as it views everything – as yet another unexplored fashion opportunity."
"I too have a built in editor with the added bonus of a whispering justifier."