一反常态 yī fǎn cháng tài

DEFINITIONS

  1. complete change from the normal state (idiom); quite uncharacteristic
  2. entirely outside the norm
  3. out of character

CHARACTERS

一 yī one; a, an; alone
反 fǎn reverse, opposite, contrary, anti
常 cháng common, normal, frequent, regular
态 tài manner, bearing, attitude