Doubtfully and Efficaciously

Opposite meaning words

Doubtfully adverb - With distrust.

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Efficaciously is an antonym for doubtfully.

Efficaciously adverb - In an effective manner.

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Doubtfully is an antonym for efficaciously in efficiently topic.

Cite this Source

Efficaciously and Doubtfully. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/doubtfully/efficaciously

Doubtfully & Efficaciously. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/doubtfully/efficaciously>.

Efficaciously or Doubtfully. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/doubtfully/efficaciously.

Google Ngram Viewer shows how "doubtfully" and "efficaciously" have occurred on timeline