constitution (physical); physical make-up; predisposition (to disease); character (of a group, organization, etc.); innate characteristics; make-up
economic; financial; economical; thrifty; frugal
fantastical idea; fanciful notion; bizarre thought
simple; artless; naive; unsophisticated
to peel off and fall; to flake away
ratio; proportion; percentage
preface; introduction; preamble
to break (into pieces); to be broken; to collapse; to crumble; to become less formal; to throw off reserve
taking care of one's sexual urges; sexual gratification
(self-imposed) masturbation ban; masturbation abstinence
double star; visual double
it's OK to ...; it's best to ...; it's alright to ...
aptitude; aptness; suitability
ghastliness; dreadfulness; grimness; intimidation; menace; threat
temporary; transient; trifling; slight; negligent
physical contact (between friends, mother and child, etc.); physical intimacy
close; intimate; on good terms
grinding of the teeth; involuntary nocturnal tooth grinding; bruxism; grinding one's teeth out of anger or vexation; gnashing one's teeth; gritting one's teeth
to have a cramp; to twitch; to stiffen (of a face, expression); to freeze; to shrink (of skin, due to a scar); to tauten
accessible; approachable; easy to approach
strong interaction; strong force
exchange; conversion; replacement; switching (to); switchover
being well versed (in); being well acquainted (with); being familiar (with); (a boy's) first ejaculation; spermarche; semenarche
in passing another (esp. colliding with oncoming traffic, bumping into a person); the moment two persons or objects meet
to abuse (verbally); to curse at; to shout abuse at; to speak ill of
sister-in-law (spouse's younger sister or younger brother's wife); younger stepsister; younger adopted sister; non-blood-related younger sister
sexual discrimination; sexism
to plant; to transplant; to instil (idea, feeling, etc.)
elder sister; effeminate man
performance; appearance (in a stage, film, TV show, etc.)
long-established; old-established; traditional
polite; respectful; reverent
see you later; goodbye; sincerely
worldwide; global; international; world-famous; world-class
courteous; decorous; polite
dignity; majesty; solemnity; gravity
to make a lasting impression