unfoundedness

Lacking any foundation

The quality of being without basis or support.

Unfoundedness describes claims, beliefs, or fears that lack evidence or justification: The unfoundedness of the accusations became clear during the investigation.

The term appears most often in formal or academic contexts when explicitly naming why something should be dismissed.

baselessness

groundless

Lacking factual support

unsubstantiatedWithout supporting evidence
baselessLacking factual support
unsupportedLacking backing or proof

unwarranted · unjustified · unproven · unverified · unconfirmed · spurious · invalid · fabricated · erroneous · fallacious

speculation

conjecture

Guess from limited facts

guessworkConclusions drawn without proof
assumptionUnverified belief accepted as true
suppositionBelief without proof

surmise · presumption · hypothesis · postulation · inference · hunch · idle speculation · wishful thinking

doubt

skepticism

Disposition toward doubt

disbeliefRejection of truth claims
uncertaintyState of being unsure
mistrustLack of faith

suspicion · incredulity · distrust · questioning · wariness · dubiousness · misgiving · reservation · qualm · hesitation

Opposites

evidential basis

unfoundednesssubstantiation

Proof of truth

justification · groundedness · factual basis · corroboration · verification

legitimacy of claims

unfoundednessvalidity

Quality of being sound

legitimacy · soundness · merit · credibility · defensibility

Family

found, foundation, founder, founding, founded, unfounded, confound, confounded, unfound

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G