unanswerable

Cannot be countered

Unanswerable describes something that cannot be answered or refuted.

An unanswerable question has no known answer or is too difficult to address: What happens after death remains unanswerable.

An unanswerable argument is so strong that no effective response exists: The evidence against him was unanswerable.

unknowable

mystery

Something unexplained or unknown

incomprehensible · inscrutable · imponderable · inexplicable · ineffable · ungraspable · unplumbable · impenetrable · fathomless · bottomless

unresolvable

paradox

Seemingly absurd truth

irresolvable · insoluble · unsolvable · intractable · uncrackable · stumper · impasse · deadlock · stalemate · riddle

ambiguous

vague

Unclear, ill-defined

equivocal · noncommittal · evasive · inconclusive · open-ended · unsettled · undecidable · uncertain · nebulous · fuzzy

forbidden

taboo

Cultural or social prohibition

confidential · privileged · restricted · sealed · suppressed · censored · redacted · silenced · unspeakable · unmentionable

Opposites
refutability (of arguments)

unanswerablerefutable

Capable of being disproven

answerable · disputable · debatable · contestable · controvertible

answerability (of questions)

unanswerableanswerable

Liable to account

solvable · resolvable · obvious · straightforward · clear

Family

answer, answers, answering, answered, unanswered, answerable

Familiarity
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Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G