noun which may take the genitive case particle 'no', noun
bottomless; endlessly deep; infinite
Describes something that has no bottom or seems to have no limit, often used figuratively for insatiable appetite, endless capacity, or boundless depth.
彼の食欲は底なしだ。
His appetite is bottomless.
底なし沼に落ちた。
I fell into a bottomless swamp.