Definitions

1. adjective

most showy or impressive

“The showiest exhibit at the science fair was a giant model of the solar system.”

2. superlative of showy

having the most showy or impressive appearance

“The showiest bird in the forest was a brightly colored parrot.”

3. superlative of showy

most attractive or impressive

“The showiest performance of the night was by the lead actress in the play.”