Definitions

1. adjective

superlative form of vaulty, meaning having a tendency or appearance of vaulting or soaring, or being extremely confident or bold

“The vaultiest of dancers leaped across the stage with ease.”

2. superlative adjective

extreme or greatest in having a tendency or appearance of vaulting or soaring, or being extremely confident or bold

“He was the vaultiest person in the room, drawing all the attention.”