Use 'gaudily' when something is overly decorated and hard to miss due to its eye-catching appearance. The carnival floats were gaudily decorated with hundreds of neon lights.
Pro Tip 2/3
Negative Nuance
'Gaudily' often implies bad taste or a lack of sophistication, so use it carefully. His gaudily painted car didn't impress the neighbors.
Pro Tip 3/3
Attention Seeking
Describe an action or look intended to draw attention as 'gaudily' done. He gaudily announced his arrival with a loud, flashy suit.