heartlessly (adv.)
- apathetically
- cold-bloodedly
- coldly
- cruelly
- deadpan
- dejectedly
- despairingly
- despondently
- disinterestedly
- dispassionately
- dispiritedly
- dully
- forlornly
- harshly
- impassively
- indifferently
- inexorably
- listlessly
- mercilessly
- numbly
- phlegmatically
- pitilessly
- relentlessly
- remorselessly
- ruthlessly
- unconcernedly
- unemotionally
- unfeelingly
- unforgivingly
- unmercifully
- unsympathetically
