[--]

Jyutping sam6 si6
Pinyin shèn shì

Definitions (Wiktionary)
  1. adv, literary
    extremely
Examples (粵典–words.hk)
  1. Cantonese
    楼主所言甚是。
    樓主所言甚是。
    lau4 zyu2 so2 jin4 sam6 si6
    • What the poster has commented is correct and reasonable.