Question

erratic 【erratic】adj.不稳定的；不规律的He is an erratic fellow whose actions are usually completely unpredictable.他是一个没有规矩的家伙，他的行为通常是完全无法预料的。

Accepted Answer

[ɪ'rætɪk] 
erraticliable to sudden unpredictable change
The adjective erratic describes things that are unpredictable, unusual, and that deviate from the norm. An erratic quarterback might completely confuse his receivers waiting for a pass.
Like its linguistic relative, error, the adjective erratic means "deviating from the norm," or "wrong." It also implies behavior or qualities that are unpredictable or odd. The word comes from the Latin verb errare, or "to wander" off course. In the field of geology, a rock that is erratic is unlike others in its environment because it has been transported by glacial activity. Likewise, someone driving a car that veers out of its lane is said to be driving erratically.
All forms of 'erratic' will appear on average once every 1816 pages.erraticerratically

Front	erratic
Pron	[ɪ'rætɪk]
Back	【erratic】 adj.不稳定的；不规律的 He is an erratic fellow whose actions are usually completely unpredictable. 他是一个没有规矩的家伙，他的行为通常是完全无法预料的。
Vocab	erraticliable to sudden unpredictable change The adjective erratic describes things that are unpredictable, unusual, and that deviate from the norm. An erratic quarterback might completely confuse his receivers waiting for a pass. Like its linguistic relative, error, the adjective erratic means "deviating from the norm," or "wrong." It also implies behavior or qualities that are unpredictable or odd. The word comes from the Latin verb errare, or "to wander" off course. In the field of geology, a rock that is erratic is unlike others in its environment because it has been transported by glacial activity. Likewise, someone driving a car that veers out of its lane is said to be driving erratically. All forms of 'erratic' will appear on average once every 1816 pages. erratic erratically

Erratic Completely Unpredictable Adjective Driving ɪ'Rætɪk Adj.不稳定的；不规律的 Fellow