Which of the following words can characterize someone who is not easily swayed by emotions?

The term "stoic" refers to a person who is capable of enduring pain or hardship without displaying their feelings or complaining. This emotional resilience implies that a stoic individual does not easily succumb to emotional turmoil or allow emotions to dictate their responses and actions. Stoicism encompasses a philosophy of emotional control and rationality, making it specifically aligned with the characteristic of being unaffected by emotions.

In contrast, the other choices do not embody this trait. "Obsessive" characterizes someone who is fixated or preoccupied with certain thoughts or behaviors, indicating a susceptibility to emotional involvement. "Recluse" refers to someone who withdraws from society, which might suggest avoidance of external emotional situations but doesn’t carry the connotation of emotional control. Lastly, "mediocre" describes average quality or performance, without any direct connection to emotional resilience. Therefore, "stoic" is the most fitting choice to define someone who maintains composure and rationality in the face of emotional stimuli.