to keep up; to retain / to maintain

situation (position vis-à-vis surroundings) of something that changes

calm, composed

calmness, composure

(uncommon) mental (relating to one's body)

strength of one's spirit; psychological strength; mental state

difficult, trying, hard

difficulties, hardship, trouble

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend