形容词

1. 不爱交际的;害羞的;孤僻的;离群索居的
Someone who is retiring is shy and avoids meeting other people.

2. see also: retire

1. reluctant to draw attention to yourself

Synonym: reticentself-effacing

2. not arrogant or presuming

e.g. unassuming to a fault, skeptical about the value of his work
a shy retiring girl

Synonym: unassuming