Sorry, no online dictionaries contain the exact phrase opposite of heartless.
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Reverse dictionary results:
1. cold
2. evil
3. beast
4. kindless
5. ogre
6. ageratum
7. angel
8. awkward
9. barb
10. beastly
11. brat
12. buttoned
13. cast
14. casted
15. deep
16. fast
17. flat
18. front
19. hope
20. iff
21. ill
22. inch
23. little
24. low
25. matte
26. moved
27. much
28. odd
29. percussion
30. perverted
31. pff
32. piano
33. poor
34. right
35. sacred
36. short
37. shorts
38. thin
39. thinned
40. thinning

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   heartless ?
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oppo*to search for words beginning with oppo, or
*lessto search for words ending with less
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