Mind you, you changed 'strength' (noun) to 'strong' (adj) in your example. "He is forceful" if you insist on playing this game. Another derived adjective if fo

Mind you, you changed 'strength' (noun) to 'strong' (adj) in your example. "He is forceful" if you insist on playing this game. Another derived adjective if forcible but it has a bit more elusive meaning (forcible entry into a building)