In operation and Inefficient

Opposite meaning terms

In operation adjective - Being in effect or operation.

Show all Definitions

Inefficient is an antonym for in operation in realistic topic.

Inefficient adjective - Not producing the desired result.

Show all Definitions

In operation is an antonym for inefficient.

Cite this Source

Inefficient and In operation. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/in_operation/inefficient

In operation & Inefficient. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/in_operation/inefficient>.

Inefficient or In operation. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/in_operation/inefficient.

Google Ngram Viewer shows how "in operation" and "inefficient" have occurred on timeline