Clammed up and Heedless
Opposite meaning terms
Clammed up
Heedless is an antonym for clammed up in unwilling to decide topic.
Heedless
Heedless adjective - Not paying or showing close attention especially for the purpose of avoiding trouble.
Clammed up is an antonym for heedless.
Cite this Source
Heedless and Clammed up. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/clammed_up/heedless
Clammed up & Heedless. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/clammed_up/heedless>.
Heedless or Clammed up. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/clammed_up/heedless.
Google Ngram Viewer shows how "clammed up" and "heedless" have occurred on timeline