Not supported by arguments, derivations or proofs.(adjective)
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Use "unargued" in a sentence
"It is sometimes suggested that ontological naturalism rests, not on reasoned argument, but on some kind of unargued commitment, some ultimate decision to nail one's philosophical colours to the naturalist mast. ["
"Which is why your comment is nothing but unsupported and unargued assertions."
"Not unlike the unargued, instant decision to drive a car off a cliff."