IPA: /ˈbɒtəmˌlɛs/
KK: /ˈbɑtəmˌlɛs/
The condition of having no bottom or being endless in depth.
The ocean's bottomlessness is both fascinating and frightening.
Bottomlessness → It is formed from "bottom" (from Old English "bōtm", meaning the lowest part) and "-less" (meaning without). The word "bottomlessness" refers to the state of being without a bottom or limit.
Think of the 'lowest part' ('bottom') and remember that 'bottomlessness' means being without a bottom or limit.