(adjective) double-minded and indecisive; wavering or undecided in mind; to be of two minds; to be in two minds; to not be able to devote attention to something and be easily side-tracked
Definitions (粵典–words.hk)
形容詞
三心二意，揸唔定主意 be in two minds
Definitions (Wiktionary)
adj, Cantonese
half-hearted; without consistency or constancy; likely to change minds easily (syn.) 三心两意, 三心兩意, 三心二意