/ɪˈrætɪk ||; əˈrætɪk/adj (used about a person's behaviour, or about the quality of sth) changing without reason; that you can never be sure of （指行为或品质）反复不定，算不住: Jones is a talented player but he's very erratic(= sometimes he plays well, sometimes badly).琼斯这个球员才能是有的，可是表现很不稳定。 ➔erratically /-kli ||; -klɪ/ adv
erratic²
/ɪˈrætɪk ||; əˈrætɪk/noun [C] (in geography 地理学) a large rock than has been carried by a moving mass of ice(a glacier)and left far away from where it was formed when the ice melted 漂砾（指给移动的冰川带至远处的巨石）