suān

Frequency star
  1. sour, tart, acidic (taste)
  2. acid (chemistry)
  3. to feel sore, to ache
  4. jealous, envious, sarcastic, bitter, cynical (informal)

過去

guòqù

Frequency star
  1. past, former times, bygone days
  2. to pass, to go by (of time)
  3. in the past, previously, formerly
  4. to go over

奇怪

qíguài

Frequency star
  1. strange, weird, odd, peculiar
  2. to find strange, to wonder about

Tends to have a negative connotation.

離開

líkāi

Frequency star
  1. to leave, to depart from, to go away from
  2. to be away from, to be separated from