Some of these attacks have been videotaped in a manner that suggests Israeli forces on the scene stood by impassively.
They both stood charged as adults and faced the judge as impassively as if it were all just what was to be expected.
1660s, "not feeling pain," from assimilated form of in- "not, opposite of" (see in- (1)) + passive. Meaning "void of emotions" is from 1690s. Related: Impassively; impassiveness (1640s).