"coyer" in the adjective sense
1. coy, demure, overmodest
affectedly modest or shy especially in a playful or provocative way
showing marked and often playful or irritating evasiveness or reluctance to make a definite or committing statement
"a politician coy about his intentions"
modestly or warily rejecting approaches or overtures
"like a wild young colt, very inquisitive but very coy and not to be easily cajoled"
Source: WordNet® (An amazing lexical database of English)
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