What does "unachievable" mean?
That cannot be achieved (or only with great difficulty).
adj ·Rare ·Advanced level
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"However, the limitations of a storytelling project such as this seems to be that the notion of validation is unachievable mainly because it falls short of the so-called 'Hitchens's razor': that 'that which can be asserted without evidence can be dismissed without evidence'."
"There's no goal that is unachievable by my own terms and by my own numerous intellectual and mental abilities."
That cannot be achieved (or only with great difficulty).
Common synonyms include: beyond one, eluding, impassable, impossible, impossible, impracticable.
There's no goal that is unachievable by my own terms and by my own numerous intellectual and mental abilities.
From un- + achievable.