性 - sex, gender, nature

habit

senile (dementia, cataract, etc.)

sensitivity; sensitiveness; sense (of ...)

individuality; personality; quirk; idiosyncrasy; character; individual characteristic

sensitivity to cold; poor circulation

reason; reasoning power; (one's) sense

motherhood; maternity

the opposite sex

tendency to become totally absorbed in something; monomania; perfectionism; fastidiousness; meticulousness

individual; distinctive; unique; characteristic; personal; idiosyncratic

neutron

affinity; compatibility; chemistry (between people)