Definitions

1. adjective

most clean or free from dirt, impurities, or unwanted substances

“This is the cleanliest restaurant I’ve been to in years.”

2. superlative adjective

more than the comparative form; used to compare three or more things

“Of all the cities we visited, this one is the cleanliest.”

3. adverb

in the cleanest or most free from dirt, impurities, or unwanted substances manner

“She lives the cleanliest, so her house is always spotless.”