Tantivy means at full gallop or at full speed, especially when riding a horse.
Tantivy can make people think of excitement, speed, and adventure.
Examples:
The horse ran tantivy through the field.
The car sped tantivy down the road.
She came tantivy into the room, full of energy.
The dog chased the cat tantivy around the yard.
The rocket flew tantivy into space.
The children ran tantivy to the ice cream truck.