There are several antonyms for the phrase "scared up." Instead of being scared or frightened, you could say someone is calm or collected. They might be confident, assured, or composed. In place of the phrase "scared up," someone could have managed, attained, or acquired something. They could also have gathered, assembled or rustled up. The antonyms for "scared up" often describe a person who is in control of the situation and not frazzled by it. They suggest that they can manage a difficult task without wavering or feeling overwhelmed.