一曝十寒

1. • one day's sun, ten days' frost (idiom, from Mencius) fig. to work for a bit then skimp
2. • sporadic effort
3. • lack of sticking power
4. • short attention span

Character by character

• 一(yī)one
• 曝(pù)sun
• 十(shí)ten
• 寒(hán)cold