Without a basis in reason or fact:
— Baseless gossip.

synoniemen: groundless, idle, unfounded, unwarranted, wild.

Roget 2: inexistent^†, nonexistent etc. 1; negative, blank; missing, omitted; absent etc. 187; insubstantial, shadowy, spectral, visionary.    unreal, potential, virtual; baseless, in nubibus [Lat.]; unsubstantial etc. 4; vain.    unborn, uncreated^†, unbegotten, unconceived, unproduced, unmade.    perished, annihilated, etc. v.; extinct, exhausted, gone, lost, vanished, departed, gone with the wind; defunct etc. (dead) 360.    fabulous, ideal etc. (imaginary) 515, supposititious etc. 514.    ... meer laten zien

Roget 4: unsubstantial; baseless, groundless; ungrounded; without foundation, having no foundation.    visionary etc. (imaginary) 515; immaterial etc. 137; spectral etc. 980; dreamy; shadowy; ethereal, airy; cloud built, cloud formed; gossamery, illusory, insubstantial, unreal.    vacant, vacuous; empty etc. 187; eviscerated; blank, hollow; nominal; null; inane.    ... meer laten zien

Pools: bezzasadny, bezpodstawny, nieuzasadniony, niezasadny