in two minds about sth (idiom); half-hearted; shilly-shallying
三 · 3 strokes
Three horizontal strokes, representing the number three.
心 · 4 strokes
Depicts a heart.
二 · 2 strokes
Two horizontal strokes, representing the number two.
意 · 13 strokes
Thought (意) is the sound (音) that comes from the mind (心). (Oversimplified for brevity. The 音 component in this character has a complicated history.)
做事情不能三心二意,要一心一意。
You can't be half-hearted when doing things; you must be wholehearted.