futileness

词形变化：

副词: futilely | 名词: futileness |

同义词：

vain | useless | ineffective | unsuccessful | fruitless | ineffectual | bootless | abortive | null | hopeless | idle | aimless | worthless | negative | pointless | wasted | unavailing | sleeveless | otiose |

反义词：

profitable | useful |