unbounded

a.无限的

unbar, unbearable, unbearably, unbeatable, unbeaten, unbecoming, unbelief, unbelievable, unbelievably, unbeliever, unbelieving, unbend, unbending, unbiased, unbidden, unbind, unblemished, unblushing, unblushingly, unborn, unbowed, unbreakable, unbridled, unbroken, unbuckle, unburden, unbusinesslike, unbutton, unbuttoned, uncalled-for, uncannily, uncanny, uncared-for, unceasing, unceasingly, unceremonious, unceremoniously, uncertain, uncertainly, uncertainty,