one's personal thoughts

private life, personal life

illegitimacy (being born out of wedlock)

a privately-owned ricefield, especially one under the historical 律令 (Ritsuryō) system

personal grudge

Kyūjitai form of 私鉄 (“private railway”)

abiogenesis, the theory of spontaneous generation

developmental biology

a person with lithe movements / kind (adj.), favor / good, excellent, surpass, superior / the best possible grade on school results / rich, wealthy / a sufficient amount for a certain thing

overgrown; luxuriant, thickly growing, lush