say it: BAY-sluhs
baseless is an adjective meaning "without a basis in reason or fact". It carries one recorded sense.
without a basis in reason or fact
“baseless gossip”
“the allegations proved groundless”
“idle fears”
“unfounded suspicions”
“unwarranted jealousy”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for baseless come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.