noun which may take the genitive case particle 'no'
unbeatable; indestructible; impossible to knock over
Literally 'not falling'; used attributively in compounds like 不倒の精神 (indomitable spirit) or 不倒の城 (impregnable castle). Not a standalone adjective in modern Japanese.
He overcame the crisis with an indomitable spirit.
The castle was known as an impregnable fortress.
tumbler doll; self-righting doll
day's longest successful jump
Compound of 不 (not) and 倒 (fall, collapse). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'unfalling' or 'indomitable'.