U
adj.无益的；无用的；无效的
adj.无益的；无用的；无效的
副词: unavailingly 名词: unavailingness
详情解释
英英释义
"a futile effort"
"the therapy was ineffectual"
"an otiose undertaking"
"an unavailing attempt"
经典引文
This time his pleas were unavailing.
出自：R. Lindner近义词
临近词