1.Definition: extremely deep
"A bottomless pit", "A bottomless lake"
2.Definition: having no apparent limits or bounds
"A bottomless supply of money", "Bottomless pockets"
3.Definition: having no bottom
"Bottomless pajamas consisting simply of a long top opening down the front"
4.Definition: unclothed especially below the waist or featuring such nudeness
"Bottomless dancers", "A bottomless bar"