Not answerable; impossible to answer. / Impossible to dispute or rebut; irrefutable; conclusive.

Something that cannot be answered.

Not affected or changed. / Lacking pretense or affectation; natural.

Someone not affected, as by a disease.

simple past tense and past participle of unaffect

Secure against attack; impregnable. / (by extension) Undeniable, incontestable or incontrovertible.

Something, such as a belief, that cannot be assailed.

In a unanimous manner; without objection.

Having no additional decoration or embellishment; plain and simple

simple past tense and past participle of unadorn