not based on fact; unfounded
WordReference Random House Learner's Dictionary of American English © 2025
base•less /ˈbeɪslɪs/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2025- having no base;
groundless: a baseless claim;
baseless fears.
base•less
(bās′lis),USA pronunciation adj.
- having no base;
without foundation;
groundless:a baseless claim.
- base1 + -less 1600–10
Collins Concise English Dictionary © HarperCollins Publishers::
'baseless' also found in these entries (note: many are not synonyms or translations):
canard
- explode
- fanciful
- groundless
- idle
- imaginary
- imagination
- paranoia
- precarious
- romance
- unfounded
- untenable
- vain