Synonyms of 'bottomless'
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If you describe something as boundless, you mean that there seems to be no end or limit to it.
His zeal for reform was boundless.
If something is deep, it extends a long way down from the ground or from the top surface of something.
The workers had dug a deep hole in the centre of the garden.
Thesaurus for bottomless from the Collins English Thesaurus
If you describe a supply of something as bottomless , you mean that it seems so large that it will never run out.