Correct Option: C

dispassionate (Adjective) : not influenced by emotion ; impartial
fervent (Adjective) : having or showing very strong and sincere feelings; ardent
inexcitable (Adjective) : not likely to become easily excited
enduring (Adjective) : lasting for a long time
subdued (Adjective) : unusually quiet and possibly unhappy; not very bright; not very loud; not very busy