unsparing

adj ~ (in sth) 1giving freely and generously 慷慨的; 大方的: be unsparingin one's efforts 不遗余力. 2 severe or merciless 严厉的; 不留情的: Nijinsky was unsparing in his demands for perfection. 尼任斯基对演技精益求精一丝不苟.

unselfish, unserviceable, unsettle, unsettled, unsettling, unshakable, unshakeable, unsightliness, unsightly, unsinkable, unskilled, unskillful, unsmiling, unsociable, unsocial, unsold, unsolicited, unsolved, unsophisticated, unsound, unsparingly, unspeakable, unspeakably, unspoiled, unspoken, unspotted, unstable, unsteadily, unsteadiness, unsteady, unstinting, unstintingly, unstop, unstoppable, unstuck, unstudied, unsubstantiated, unsuccessful, unsuitable, unsung,