sharp; pointed; acute; keen

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

sensitivity / (anatomy) nerve

stairs used in emergencies

state of emergency (unusually difficult or dangerous situation)

reflector

reflective item, such as the reflectors attached to bicycles

(neuroscience) spinal reflex / (informal) reflex (response)