early 14c., "without a bottom," from bottom + -less. From 1560s as "baseless, unsubstantial."
a bottomless pit
a bottomless lake
bottomless pajamas consisting simply of a long top opening down the front
bottomless pockets
a bottomless supply of money
a bottomless bar
bottomless dancers
bottle
bottleneck
bottle-nose
bottom
bottom line
bottomless
bottom-most
botulism
bouche
boudoir
bouffant
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