ir·reg·u·lar/ɪ`rɛgjələ; ɪˈreɡjlə/ adj 1 having a shape or surface that is not smooth or even 〔形状〕不规则的; 〔表面〕不平整的: a face with irregular features 一张五官不端正的脸孔 2 not happening at regular times or at the usual time 〔时间〕不规律的，不按时的，不定时的: an irregular heartbeat 不规律的心跳 3 not following the usual rules in grammar 〔语法〕不规则的: irregular verbs 不规则动词 4BrE formal slightly dishonest or illegal 【英，正式】不道德的; 不合法的: This is all highly irregular. 这很不道德。