Synonyms of futility

3 Syllables
idleness, hollowness, pointlessness, worthlessness, emptiness, fruitlessness
4 Syllables
frivolousness, meaninglessness, senselessness
5 Syllables
unlikelihood
6 Syllables
impossibility, unfeasibility, unworkability, ineffectuality, unprofitableness, ineffectiveness, impossibilities
7 Syllables
impracticability, unattainability