unhesitating

a. 不踌躇的,不犹豫的,敏捷的

ungovernable, ungracious, ungraciously, ungrammatical, ungrammatically, ungrateful, ungratefully, ungrudging, unguarded, unguent, unguided, unhappily, unhappiness, unhappy, unhealthily, unhealthiness, unhealthy, unheard, unheard-of, unheroic, unhinge, unholiness, unholy, unhoped-for, unhorse, unhurt, uni-, UNICEF, unicellular, unicorn, unidentified, unidimensional, unidirectionally, unification, unified, uniform, uniformed, uniformity, uniformly, unify,