source (e.g. of a river); headwaters; origin of something continuous (language, culture, etc.)
ancestor; forefather; originator; pioneer; grandfather
separation of ages; being of a different age
genealogy; lineage; family tree; pedigree
counting backwards; calculating backwards; inverse operation
(transplant) rejection; strong reaction (against)
derisory; negligible; minimal; nominal; imperceptible
last days; the end; one's fate
experiments using animals; in-vivo testing; animal testing
precious; valuable; priceless; noble; exalted; sacred
bottomless; unlimited; immeasurable; inexhaustible
faint-inducing; dizzying; overwhelming; mind-numbing; staggering
bygones; the past; past event
ecstatically; spellbound; with rapt attention; abstractedly; absentmindedly; absorbedly
goody goody; goody two-shoes; teacher's pet
reason; principle; general principle (as opposed to individual concrete phenomenon); the underlying principles of the cosmos (in neo-Confucianism)
to prove successful; to take hold; to amount to something
secrecy; confidentiality; privacy; one's circumstances (esp. fiscal)
adaptation (of a poem, novel, etc.); recasting; rewriting; modification; rehashing
extinction; extinguishment; disappearance; annihilation
to be dying; to be about to die; to be close to death
to show one's age (e.g. to start creaking at the joints); to wear out (e.g. machinery)
commemorable; worth commemorating; momentous; monumental
important task; important role; major part (in a film, play, etc.); leading role; high-scoring combination
valid; effective; yuko (judo)
purpose; utility; objective; way to use something
stupor; stupefaction; trance; (being) dumbfounded
dregs; lees; grounds; pent-up feelings
cancellation; liquidation; resolution; reduction (e.g. of stress)
freely; frankly; without reserve
to bark; to howl; to howl (of the wind); to roar (of the sea); to yell; to shout
to give one's first cry (of a newborn baby); to be born; to come into being; to be formed
viscous; mushy; muddy; dirty (with oil, grease, etc.); to be in an ugly state (of emotions, relations, etc.); to be murky
end; tip; extremities; rank and file; part of an organisation furthest from the centre
indicates being the subject or receiver of an action, decision, etc.; -ee (e.g. employee, examinee, trustee)
to press down; to hold down; to pin down; to suppress (feelings, disorder, opposition, etc.); to repress
one's own strength and skill alone (without money, connections, etc); nothing to rely on but oneself; (being) self-made
batsu game; punishment given to the loser of a game or contest
leaving everything up to someone else