Hello there! If the forces on an object are not equal and opposite, then they are unbalanced.
Isaac Newton’s third law of motion states that for every action, there is an equal and opposite reaction. This refers to most situations in which the two forces exerted on something apply the same amount of force, creating a state of balance without movement. For example, one could push a wall and it would not move. The wall exerts an equal and opposite force on the person that causes no movement. Hope this helps!