Unsubstantiated

adj, verb

adj, verb ·6 syllables ·Uncommon ·Advanced level

Definitions

Verb
  1. 1
    simple past and past participle of unsubstantiate form-of, participle, past
Adjective
  1. 1
    Lacking substantiation; without evidence.

    "Such hedging is necessitated by the lack of in-depth knowledge of the contents, which also gives free rein to the scripting of unsubstantiated factoids concerning the book."

Adjective
  1. 1
    unsupported by other evidence wordnet

Synonyms

All synonyms
unsupportedbaselessflimsyfootlessgroundlessgroundless

Example

More examples

"Meanwhile, another cruise ship, the Westerdam, finally docked Thursday in the Cambodian port of Sihanoukville, ending a two-week-long saga that saw the ship being turned away by Japan, Thailand, Taiwan and the Philippines due to unsubstantiated fears that someone on board had been infected."

Etymology

Etymology 1

From un- + substantiated.

Etymology 2

From unsubstantiate + -ed.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.