unverifiably en · ADV
Etymology
From unverifiable + -ly.
Meanings
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(not-comparable) In an unverifiable way.
Near-synonyms: unconfirmably, untraceably, unprovably; deniably
I want a rational explanation of reality - not a metaphysical one, that can easily and unverifiably be posed by any crackpot - well-intentioned or otherwise.
2010, Des Greene, The Island:
Antonyms
traceably · undeniably · confirmably · verifiably · provably