Similar words: worthless, ruthlessness, faithlessness, toothless, ruthless, faithless, breathless, ruthlessly. Meaning: ['mɜrθlɪs] 
adj. lacking mirth.
adj. lacking mirth. 
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1. He was falsely jovial, with his booming, mirthless laugh.
2. She suppressed a mirthless smile.
3. 'Now it's your turn,' he said with a mirthless grin.
4. But it was a titter far from being mirthless.
5. Others portrayed his austere demeanour and mirthless, rumbling laugh in a more sinister light.
6. Some laughed again: mirthless but with meaning.
7. His mirthless smile made all of us uncomfortable.
8. He permitted himself a small mirthless smile.
9. As she a mirthless smile , her even white teeth were bared as if ready to bite.
10. Mirthless high malicious laughter.
11. We have been fed up with the mirthless routine work all day long.
12. Father Wilfred Knox, a nice fellow but with a horrible mirthless titter.
13. Her scrunched up face made her look as if she was wearing a perpetual mirthless grin.
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14. Hsinmei quickly added, " Of course, I've no experience, " and laughed a forced, mirthless laugh.
15. His mouth corners curved in his highly individual, cold, almost mirthless smile.
More similar words: worthless, ruthlessness, faithlessness, toothless, ruthless, faithless, breathless, ruthlessly, breathlessly, mirth, mirthful, much less, matchless, quenchless, speechless, speechlessly, nevertheless, athlete, athletic, athletics, athleticism, less and less, fourthly, earthly, unearthly, birth, girth, rebirth, birthday, birthstone.