unnerve

v [Tn] cause (sb) to lose self-control, confidence or courage 使（某人）失去自制力、 信心或勇气: His encounter with the guard dog had completely unnerved him. 他遇上了警卫犬, 把他吓坏了.

unmanageable, unmanly, unmanned, unmannerly, unmarried, unmask, unmatched, unmentionable, unmentionables, unmerchantable, unmindful, unmistakable, unmistakably, unmitigated, unmoved, unmoving, unnatural, unnaturally, unnecessarily, unnecessary, unnerving, unnoteworthy, unnoticed, unnumbered, UNO, unobjectionable, unobservable, unobserved, unobstructed, unobtainable, unobtrusive, unobtrusively, unoccupied, unofficial, unofficially, unoriginal, unorthodox, unorthodoxy, unpack, unpaid,