Before we had gaslighting and narcissism, passive-aggressive behavior was considered a major faux pax. It still is and for good reason. But let's back up a second—what exactly is "passive aggression"?

Ukrainian President Petro Poroshenko condemned Russia on Monday in their launch of "direct and open aggression," which he said had radically altered the battlefield between Kiev and pro-Moscow ...

Human men are typically more aggressive than human women, a finding supported by reams of research. But surveys of 4,136 individuals in 24 countries reveal an exception to the trend: aggression in ...

They sound harmless, but they’re not. And yes, you’ve probably said at least one of them.