unfathomable
/ˌʌnˈfæðəməbl/adjective
1- incapable of being fully explored or understood高深莫测的; 不可理解的：
her grey eyes were dark with some unfathomable emotion.
她灰色的眼睛深沉, 有某种神秘情感。
1.1
- (of water or a natural feature) impossible to measure the extent of（水, 自然特征）深不可测的。
派生词