Antonym: diffidence. Similar words: confidence, confident, confidential, confidentiality, self-contempt, confide, confidant, evidence. Meaning: n. freedom from doubt; belief in yourself and your abilities.
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1. Self-confidence is the first requisite to human greatness. 
2. He inspired self-confidence in his pupils.
3. Getting the job did wonders for her self-confidence.
4. Self-confidence and self-reliance are the mainstays of a strong character.
5. We should have the perseverance, must have the self-confidence especially! We must believe, our talent is used to do something.
6. Self-confidence means being relaxed enough to allow your lover their personal space.
7. He constantly tried to undermine her self-confidence.
8. He ruined her self-confidence with a few well-chosen words.
9. She possesses a self-confidence that borders on arrogance.
10. Anna's self-confidence had been completely shattered.
11. She projects an air of calm self-confidence.
12. Her self-confidence borders on arrogance.
13. Jealousy is, at bottom,(sentencedict.com) a lack of self-confidence.
14. His swaggering self-confidence irritates many people.
15. His attractiveness is partly due to his self-confidence.
16. His constant criticism ate away at her self-confidence.
17. Her self-confidence will develop alongside her technique.
17. Sentencedict.com try its best to gather and make good sentences.
18. The success further inflated his self-confidence.
19. His easy gait shows self-confidence.
20. She had an air of self-confidence that he admired.
21. I seem to have lost all my self-confidence.
22. His encouragement was a great prop to her self-confidence.
23. He has no self-confidence.
24. His self-confidence took a sudden jolt with the news that he had not been selected.
25. Is a lack of self-confidence undercutting your performance at work?
26. He has a self-confidence that is sometimes seen as arrogance.
27. Their failures in this area have damaged their self-confidence and creditability.
28. He possesses sublime self-confidence.
29. Life without regret, dead things like a gust of wind; life without regret, it will still have to come; life need not be annoyed, anxious white hair to black; life need not be lamented, loss of self-confidence will lose everything!
30. He thought a few kind words might boost her self-confidence.
More similar words: confidence, confident, confidential, confidentiality, self-contempt, confide, confidant, evidence, incidence, residence, providence, coincidence, conference, confluence, preponderance of evidence, infidel, infidelity, diffident, confirm, confine, confined, diffidently, configure, confirmed, confiscate, confinement, confirmation, confiscation, be confined to, configuration.