肆 ㄙ ˋ sì 无 ㄨ ˊ wú 忌 ㄐㄧ ˋ jì 惮 ㄉㄢ ˋ dàn 肆 ㄙ ˋ sì 無 ㄨ ˊ wú 忌 ㄐㄧ ˋ jì 憚 ㄉㄢ ˋ dàn absolutely unrestrained unbridled without the slightest scruple