to feel even more (lonely etc); to be extremely (sad, delighted etc)
Definitions (粵典–words.hk)
動詞
更加覺得;加倍感到 to feel even more; to feel increasingly
獨處異鄉,每逢佳節,倍感寂寞。
独处异乡,每逢佳节,倍感寂寞。
duk6 cyu5 ji6 hoeng1, mui5 fung4 gaai1 zit3, pui5 gam2 zik6 mok6. Far from home alone, I feel more lonely during festivals.