Usage patterns
〈人〉が頑強に抵抗するfor someone to resist stubbornly
He stubbornly resisted the police interrogation.
頑強な体a tough, sturdy body
He is a wrestler famous for his tough physique.
頑強に反対するto stubbornly oppose something
The residents stubbornly opposed the plan.
頑強な構造a sturdy, robust structure
This bridge is known for its sturdy structure.