only after a great struggle or long effort

incumbent or duty-bound as a matter of moral responsibility; a duty that cannot be shirked

to brook no delay; to demand immediate action

completely incompatible or irreconcilable, like fire and water

in a state of extreme urgency; on the brink of crisis or disaster

allowing no room for argument or debate; absolutely certain or peremptory

the principle that two powerful individuals or rivals cannot coexist peacefully within the same territory or domain