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strong powerful sturdy robust resilient mighty potent vigorous forceful tough intense solid steadfast unyielding tenacious determined energetic dynamic assertive commanding compelling dominant formidable unshakable indomitable unwavering fierce unbreakable authoritative hardy brave enduring unassailable relentless durable ironclad rugged empowered impressive influential herculean strengthened rock-solid impenetrable unbeatable pervasive steely unswerving unflagging