Idle
Idle adjective - Not being in a state of use, activity, or employment.
Lacking foundation and idle are semantically related. in groundless topic. In some cases you can use "Lacking foundation" instead an adjective "Idle".
Lacking foundation
Idle and lacking foundation are semantically related. Sometimes you can replace term "Idle" with "Lacking foundation", this terms are similar.
Mutual synonyms
Cite this Source
Lacking foundation and Idle. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/idle/lacking_foundation
Idle & Lacking foundation. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/idle/lacking_foundation>.
Lacking foundation or Idle. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/idle/lacking_foundation.
Google Ngram Viewer shows how "idle" and "lacking foundation" have occurred on timeline