Hazrat Jafar Sadiq (r) said: "Beware of the company of five persons:

A liar: You will always be misled by him.

A stupid person: Even if he intends to benefit you, he will harm you without realising it.

A miser: He will destroy your valuable time.

A coward: He will leave you in the lurch at the time of need.

A faasiq: On account of greed, he will betray you for a morsel of food.

Source: Scattered Pearls