Frothingly, bubbly and foaming are all synonyms for the word 'frothily'. All three words depict a state of liquid that is in motion, producing bubbles or froth. Frothingly is a word that aptly describes the movement of a liquid, like a river flowing rapidly or waves crashing against the shore. Bubbly is a word that often describes the appearance of a liquid, the way it sparkles with bubbles. Foaming, being the closest synonym to frothily, is used to describe a state of agitation in a liquid, creating a foam or soap type substance. These three words are interchangeable with 'frothily', and are useful in describing different aspects of a liquid's state.