incautious
adjective formal uk/ɪnˈkɔː.ʃəs/ us/ɪnˈkɑː.ʃəs/
不谨慎的，轻率的
not showing or giving careful thought to the possible results
Bill and Sandra haven't spoken to each other since he made an incautious remark about her husband's drinking problem. 自从比尔对桑德拉丈夫的酗酒问题大意失言，他们就没再说过话。