1. 稳步的, 坚决的, 专心的：hysterotabetism 癔脊病髓痨 | unfaltering 稳步的, 坚决的, 专心的 | trailing bogie 后转向架

2. 专心的：unfaithfully 不忠实地 | unfaltering 专心的 | unfamiliar 不熟悉的

3. 不晃晃摇摇的：unfairfavoritisminequityunfairness 不公平 | unfaltering 不晃晃摇摇的 | unfashionable 不流行的

4. 不晃晃摇摇的/坚决的/专心的：unfaithfully /不忠实地/ | unfaltering /不晃晃摇摇的/坚决的/专心的/ | unfamiliar /陌生/

adj

1. marked by firm determination or resolution
not shakable

e.g. firm convictions
a firm mouth
steadfast resolve
a man of unbendable perseverence
unwavering loyalty

Synonym: firmsteadfaststeadystiffunbendableunshakableunwavering