96 entries under adjective topic. ×

20
groundless(reason, poor, foolish, true)
15
unfounded(false, foolish, true, crazy)
15
unwarranted(right, reasonable, true, untrue)
11
idle(false, true, hollow, unwarranted)
11
unjustified(unwarranted, untrue, illogical, deceptive)
9
ungrounded(poor, negative, untrue, vacant)
9
bottomless(false, true, senseless, unwarranted)
9
gratuitous(false, unwarranted, untrue, necessary)
9
unjustifiable(unwarranted, substantiation)
9
unsupported(false, unwarranted, untrue, substantiation)
7
flimsy(poor, negative, untrue, implausible)
7
uncalled-for(false, senseless, unwarranted, untrue)
7
unsound(foolish, unreasonable, worthless, unacceptable)
6
false(poor, worthless, unwarranted, unacceptable)
5
indefensible(senseless, unwarranted, wanton, gratuitous)
5
unsubstantiated
5
untenable
4
invalid(foolish, unreasonable, worthless, unacceptable)
4
unsustainable
4
vain
11 years ago|7.1k views|share |citing 
APASmart Define. (2015). baseless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/baseless/thesaurus/synonyms
ChicagoSmart Define. 2015. "baseless thesaurus" https://smartdefine.org/baseless/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, baseless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/baseless/thesaurus/synonyms>.
MLASmart Define. "baseless thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/baseless/thesaurus/synonyms>