1. most full of froth or foam; most bubbly
Usage: superlative form of frothy
2. most light, trivial, or lacking in substance
Usage: figurative use

Examples

• The cappuccino had the frothiest milk foam I’d ever seen.
• This was the frothiest beer on tap at the brewery.
• The ocean waves looked frothiest during the storm.
• Critics dismissed it as the frothiest entertainment of the season.
• Her frothiest novels were surprisingly popular with readers.
• The magazine’s frothiest articles were about celebrity gossip.