Definitions

1. adjective

more untidy or disordered in appearance or condition

“The backyard had become messier after the storm.”

2. adjective

more complicated or difficult to understand

“The theory is messier than we initially thought.”

3. noun

a person or thing that causes a mess or untidiness

“The messy tourist littered the park with trash.”

4. noun

a member of a 19th-century French astronomical society, especially one who cataloged deep-sky objects

“Charles Messier was a renowned Messier.”