mindmap root((无用)) vain implies either absolute or relative absence of value or worth: it's ~ to think that we can alter destiny. nugatory suggests triviality or insignificance: a monarch with ~ powers. otiose suggests that something serves no purpose and is either an encumbrance or a superfluity: not a single scene in the film is ~. idle suggests a lack of capacity for worthwhile use or effect: it is ~ to speculate on what might have been. empty, hollow suggests a deceiving lack of real substance, soundness, genuineness, or value: an ~ attempt at reconciliation; a ~ victory that benefited no one.