莫測高深 [－测－－]

Jyutping mok6 cak1 gou1 sam1
Pinyin mò cè gāo shēn

Definitions (CC-CEDICT)
  1. enigmatic
  2. beyond one's depth
  3. unfathomable
Definitions (Wiktionary)
  1. phrase, idiomatic
    too profound to be understood; enigmatic; unfathomable
    (syn.) 高深莫測, 高深莫测
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）