blatant, shameless, or barefaced (e.g., an obvious lie or insincere compliment); openly insincere.
そんな白々しい嘘は子どもでも見抜ける。
Even children can see through such an obvious lie.
彼の白々しいお世辞にうんざりした。
I was fed up with his shameless flattery.
証拠があるのに白々しい顔をするな。
Don't put on such a shameless face when there's evidence.
feigning ignorance; pretending not to know (a disingenuous attitude).
彼は事故を見ていたのに白々しい態度で知らないと言った。
He had seen the accident but pretended not to know with a shameless attitude.
『知らないよ』と白々しく言うな。
Don't say 'I don't know' so obviously insincerely.
(rare/poetic) very white or brightly clear in appearance; pallidly bright.
冬の夜、月が白々しく空を照らしていた。
On a winter night the moon shone whitely across the sky.
雪で景色が白々しく覆われている。
The landscape is covered in a pale white by the snow.