unhectic
/ʌnˈhɛktɪk/Definitions
1. adjective
free from or characterized by a feverish or agitated quality; unruffled
“She remained unhectic, even when the news of the sudden crisis reached her.”
2. noun
a quality of being free from or characterized by a feverish or agitated quality; unruffledness
“Her unhectic nature helped her stay calm in emergency situations.”