| definiteness(noun, skill, truth, certainty, sharpness) | |
| definitiveness(noun, skill, truth, certainty, sharpness) | |
| definitude(noun, skill, truth, certainty, sharpness) | |
| dependableness(noun, ability, trustworthiness, maturity) | |
| dextrousness | |
| dignity(truth, correctness, rectitude) | |
| diplomacy | |
| dispatch(noun, ease, peace, simplicity, freedom) | |
| drive(noun, activity, go, power, strength) | |
| duck soup(noun, expression, ease, peace, simplicity) | |
| easiness(noun, ease, peace, simplicity, familiarity) | |
| easygoingness(noun, ease, peace, simplicity, freedom) | |
| effeciency | |
| effectual | |
| effectuality(noun, affect) | |
| efficacious | |
| efficacity | |
| efficency | |
| efficiencies | |
| efficient |
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| APA | Smart Define. (2016). efficiency thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/efficiency/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "efficiency thesaurus" https://smartdefine.org/efficiency/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, efficiency thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/efficiency/thesaurus/synonyms>. |
| MLA | Smart Define. "efficiency thesaurus" 25 February 2016. Web. 20 September 2026. <https://smartdefine.org/efficiency/thesaurus/synonyms> |