bootless
/ˈbuːtlɪs/adjective
- archaic (of a task of undertaking) ineffectual; useless〈古〉无用的, 无益的：
remonstrating with him seems ever to have been a bootless task.
向他抗议看来一向是没有用的。
词源
Old English bōtlēas 'not able to be compensated for by payment' （see BOOT2, -LESS）.