COY is validvalid

shy [adj COYER, COYEST] : COYLY [adv], COYNESS [n] / to caress [v COYED, COYING, COYS]

270 of 196,601 in NWL2023·also valid in CSW24

modest, bashful [adj COYER, COYEST, COYLY] / to affect coyness [v -ED, -ING, -S]