errant

形容词 errant:

1. straying from the right course or from accepted standards
2. uncontrolled motion that is irregular or unpredictable

1. An errant husband is one who leaves his wife for other women.
   走邪路的丈夫是指离开自己的妻子去跟别的女人私通。

er.rant

adj.（形容词）
Roving, especially in search of adventure:
游历的：尤指为寻求冒险经历而漂流、游荡的：
例句：
knights errant.
游侠

Straying from the proper course or standards:
犯错误的：偏离适宜轨迹或标准的：
例句：
errant youngsters.
走入歧途的少年

Wandering outside the established limits:
偏离正道的：飘忽于正常限定范围之外：
例句：
errant lambs.
迷途的羔羊

Aimless or irregular in motion:
漫无目的的：行为无目的或不规则：
例句：
an errant afternoon breeze.
午后飘忽不定的微风

来源：
Middle English erraunt
中古英语 erraunt
from Anglo-Norman
源自 英法语
partly from Old French errer [to travel about] from Vulgar Latin *iter3re from Latin iter [journey] * see ei-
部分源自 古法语 errer [四处游荡] 源自 俗拉丁语 *iter3re 源自 拉丁语 iter [旅程] *参见 ei-
and partly from Old French errer [to err] * see err
并且部分源自 古法语 errer [犯错误] *参见 err

【引伸】
er.rant
n.（名词）
er.rantly
adv.（副词）