無

person who has not won any major awards or titles despite being the best in a particular field; uncrowned king

person who wields power without holding an official rank or title

journalist (esp. newspaper journalist)

Proverb

nature itself is a good mother; even without parents, children grow up

open freight car

unauthorized reproduction; unauthorised reproduction; unauthorized copying; unauthorised copying

dryness; dullness

Computing

chatterbot; chatbot

Buddhism

all things are essentially nothingness; all things come from nothingness; originally, there was nothing; Zen reminder to free oneself from attachments

extremely thrilling

Yojijukugo

abandoning artifice and just being oneself; doing nothing and taking things as they come

Buddhism

unconditioned nature; unconditioned spontaneity

nonstop flight

idle and incompetent; accomplishing nothing significant nor being capable of doing so; lacking the talent to do anything but idle away one's time

Mathematics

infinite series

Mathematics; Physics

dimensionless number

laboring in vain; wasted effort; vain efforts

peerless; unequaled; unequalled

radio (wireless) operator; radioman

stateless person

hitchhiking

wireless technology

government emergency radio system for disaster prevention and relief

important intangible folk culture asset

Proverb

you can't give (use) what you don't have; nothing comes from nothing; you can't shake sleeves you don't have

heinous; treacherous; atrocious; diabolic; fiendish; inhuman

Pre-noun adjectival (rentaishi)

without limit; endless