groundless

adj.
Having no ground or foundation; unsubstantiated: groundless optimism. See synonyms at baseless.

groundlessly ground'less·ly adv.
groundlessness ground'less·ness n.

adjective

Having no basis or foundation in fact: baseless, bottomless, idle, unfounded, unwarranted. See true/false.

adj

Definition: without reason, justification; false
Antonyms: called-for, grounded, justified, proven, reasonable, true, warranted

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Note: click on a word meaning below to see its connections and related words.

The adjective has one meaning:

Meaning #1: without a basis in reason or fact
  Synonyms: baseless, idle, unfounded, unwarranted

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Dansk (Danish)
adj. - ubegrundet, grundløs, uberettiget, løs

Nederlands (Dutch)
ongegrond

Français (French)
adj. - injustifié, sans fondement, non fondé (un espoir)

Deutsch (German)
adj. - unbegründet

Ελληνική (Greek)
adj. - αθεμελίωτος, ανεδαφικός

Italiano (Italian)
infondato

Português (Portuguese)
adj. - sem motivo

Русский (Russian)
беспочвенный

Español (Spanish)
adj. - infundado, sin fundamento

Svenska (Swedish)
adj. - grundlös

中文（简体）(Chinese (Simplified))
无根据的, 无理由的, 无基础的

中文（繁體）(Chinese (Traditional))
adj. - 無根據的, 無理由的, 無基礎的

한국어 (Korean)
adj. - 근거 없는, 까닭 없는

日本語 (Japanese)
adj. - 根拠のない, 理由のない

العربيه (Arabic)
‏(صفه) لا مبرر او اساس, له‏

עברית (Hebrew)
adj. - ‮נטול יסוד, חסר שחר‬

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