1821Scott Kenilw. xvii, Like one..whose only safety consists in moving onwards, by firm and unvacillating steps.
1825Beddoes Let. in Poems (1851) 166 In the unvacillating soar of song.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。