sitting duck

defenseless

defensive preparations against military threats / preparations for natural disasters

fortify, prepare to defend against enemies or natural disasters

(euphemistic) sexless, having no sexual activity for a long time (between a married couple)

(colloquial) -less

(Internet) to reply; to respond

(Internet) reply; response (to an electronic message)

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

perfect, completed