Use the adjective intensified to describe something that has become stronger or faster, like an intensified effort that brought a football team back from near-certain defeat.
To correctly pronounce intensified, accent the second syllable: "in-TEN-suh-fied." Intensified is the adjective form of the verb intensify, which means "to make stronger, sharper, deeper" or "to heighten." So something that is intensified has been made stronger, sharper, or deeper, or has been heightened, like an intensified search for a missing person.