diffidence       
noun [ U ] uk/ˈdɪf.ɪ.dəns/ us/ˈdɪf.ɪ.dəns/
 羞怯,缺乏自信
the quality of being shy and not confident of your abilities
  The biggest difficulty is overcoming natural British diffidence 最大的困难是克服英国人天生的不自信心态。 
 There was a diffidence in her soft voice. 她轻柔的声音里透着一丝羞怯。 
 See: diffident
 - More examples
- She spoke rather hesitantly, though this was less to do with diffidence than good manners.
- Someone found the words to break the uneasy diffidence.
- He spoke with a certain diffidence which added to his charm.