WordWeb Online

1. Affectedly modest or shy especially in a playful or provocative way
   - demure, overmodest
    
2. Showing marked and often playful or irritating evasiveness or reluctance to make a definite or committing statement
   "a politician coy about his intentions"
    
3. Modestly or warily rejecting approaches or overtures
   "like a wild young colt, very inquisitive but very coy and not to be easily cajoled"

Sounds like: koi

Derived forms: coyest, coyer

See also: indefinite, modest, timid

Encyclopedia: Coy, Jonathan