one darnedest (noun) attempt: try, effort
Sinonime: abstract, absurd, chimerical, idealistic, illogical, impossible, impractical, improbable, inapplicable, inefficacious, infeasible, inoperable, irrealizable, ivory-tower, no-go, nonfunctional, nonviable, not a prayer, otherworldly, out of the question, quixotic, romantic, speculative, starry-eyed, theoretical, unattainable, unbusinesslike, unfeasible, unnegotiable, unreal, unserviceable, unusable, useless, visionary, wild, won't fly
Antonime: certainty,
laziness,
success