A. Forcible
B. Forceful
C. Weak
D. Tough
E. Haughty
Forcible : done by force.
Forceful : strong and assertive, vigorous and powerful.
Tough : strong enough to withstand adverse conditions or rough handling.
Haughty : arrogant or conceited
Mighty : possessing great and impressive power or strength.
So, opposite of Mighty is Weak.
