Heartless
Heartless adjective - Having or showing a lack of sympathy or tender feelings.
Usage example: a heartless boss who would fire people for missing work, even if they were sick as a dog
Tough and heartless are semantically related. In some cases you can use "Tough" instead an adjective "Heartless".
Nearby Words: heart, heartlessly
Mutual synonyms
Both words in one sentence
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While she is a polar bear, she is clearly smiling when Judy begins to excel at her training indicating that while it's her job to be tough and demanding, she's not heartless.
Source: Disney / Zootopia -
However, once Clara realizes the Doctor was forced to make tough decisions and isn't as heartless as he lets on, not only do they make-up and agree to continue their friendship, a Love Triangle scenario launches.
Cite this Source
Tough and Heartless. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/heartless/tough
Heartless & Tough. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/heartless/tough>.
Tough or Heartless. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/heartless/tough.
Google Ngram Viewer shows how "heartless" and "tough" have occurred on timeline