/ʌn'ri:zənɪŋ; ʌn`riznɪŋ/
adj (fml 文) (of a person or of attitudes, beliefs, etc) not using or guided by reason （指人或指态度、信仰等）不凭理智的, 无理性的
*an unreasoning fear of foreigners 对外国人无缘由的恐惧.