unprovoked

adj (esp of verbal or physical violence) without provocation; not caused by previous action （尤指暴力言行）未受招惹而自发的, 无缘无故的: ,unprovoked aggression/attacks 无端的侵犯[攻击].

unpopular, unpopularity, unpractised, unprecedented, unprecedentedly, unpredictable, unprejudiced, unpremeditated, unprepossessing, unpretentious, unprincipled, unprintable, unproductive, unprofessional, unprofessionally, unprofitable, unpromising, unprompted, unpronounceable, unprovided, unpunished, unputdownable, unqualified, unquestionable, unquestionably, unquestioned, unquestioning, unquestioningly, unquiet, unquote, unravel, unread, unreadable, unreadiness, unreal, unrealistic, unreality, unreasonable, unreasonably, unreasoning,