Anything that cannot be attained.

(advertising) In advertising research, recognition of a specific brand or product without being prompted with possible names.

In a manner that is not ambiguous; leaving no doubt; clearly

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.