diffident russian

• тушу́ющийся

  shy, bashful, diffident, self-conscious

• неуве́ренно

  uncertainly, hesitantly, unsurely, diffidently

  unsteadily, shakily

• стыдли́во

  diffidently, bashfully, shyly

• несмело

  timidly, shyly, hesitantly, diffidently