compulsatory

CIDE DICTIONARY

compulsatory, a. 

 Operating with force; compelling; forcing; constraining; resulting from, or enforced by, compulsion.  [1913 Webster]
"To recover of us, by strong hand
And terms compulsatory, those foresaid lands."  [1913 Webster]

ROGET THESAURUS

compulsatory

Compulsion

N compulsion, coercion, coaction, constraint, duress, enforcement, press, conscription, force, brute force, main force, physical force, the sword, ultima ratio, club law, lynch law, mob law, arguementum baculinum, le droit du plus fort, martial law, restraint, necessity, force majeure, Hobson's choice, compelling, coercive, coactive, inexorable, compulsory, compulsatory, obligatory, stringent, peremptory, forcible, not to be trifled with, irresistible, compelled, fain to, by force, by force of arms, on compulsion, perforce, vi et armis, under the lash, at the point of the sword, at the point of the bayonet, forcibly, by a strong arm, under protest, in spite of one's teeth, against one's will, nolens volens, by stress of circumstances, by stress of weather, under press of, de rigueur, with a gun to one's head, I'll make him an offer he can't refuse.