Strong-arm
Part of speech: verb
Definition: To bully; to intimidate. To coerce, to muscle.
Part of speech: adjective
Definition: Bullying; extortionate. Coercive, employing force.
Forceful
Part of speech: adjective
Definition: With assertive force; powerful.
Example sentence: Our purpose in Vietnam is to prevent the success of aggression. It is not conquest, it is not empire, it is not foreign bases, it is not domination. It is, simply put, just to prevent the forceful conquest of South Vietnam by North Vietnam.