| 不 |
bù yú | (literary) (of loyalty, affection etc) unchanging; unwavering; constant |
| 不 |
bù | no; not so / (bound form) not; un- |
| 渝 |
Yú | short name for Chongqing 重庆 / old name of Jialing River 嘉陵江 in Sichuan |
| 渝 |
yú | (literary) (of faith, affection etc) to change; to waver (usu. in 不渝) |