meaningless
aimless, empty, futile, hollow, inane, inconsequential, insignificant, insubstantial, nonsensical, nugatory, pointless, purposeless, senseless, trifling, trivial, useless, vain, valueless, wanky (taboo slang) worthless
Antonyms
clear, coherent, comprehensible, consequential, decipherable, deep, evident, important, intelligible, legible, meaningful, obvious, purposeful, sensible, significant, understandable, useful, valuable, worthwhile