flat, unchanged / expressionless, blank

difficult / hard, probably impossible

being flat, unchanged / blankly, without expression

an emotion, a feeling, feelings, a sentiment

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

he; boyfriend

face / expression

a person's face / a person's reputation

look; face; expression / color