相关单词同义词sudden, unexpected, occasional, 近义词 accidental 意外的, casual 非正式的, adventitious 偶然的, contingent 代表团, circumstantial 依情况而定的..., chance 可能性, unexpected 想不到的, unplanned 无计划的, incidental 附带的, causeless 无原因的, uncaused 无前因的(非创造的...反义词intentional, 存心的临近词fortunate, fortress, fortuitously, fortuitous error, fortuitous event, fortuitous change, fortuitous jitter, fortuitous defense, fortuitous meeting, fortuitous casualty, fortuitous accident, fortuitous causalty相似词fortis, fortitude, fortnight, fortress, fortunate, fortunately, fortune, fortune cookie, 返回 fortuitous