Sure
Tireless
Tireless adjective - Showing no signs of weariness even after long hard effort.
Sure and tireless are semantically related. Sometimes you can use "Sure" instead an adjective "Tireless".
Nearby Word: tirelessly
Mutual synonyms
Cite this Source
Tireless and Sure. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/sure/tireless
Sure & Tireless. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/sure/tireless>.
Tireless or Sure. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/sure/tireless.
Google Ngram Viewer shows how "sure" and "tireless" have occurred on timeline