What does "messier" mean?

comparative form of messy: more messy

What is a synonym for "messier"?

Common synonyms include: chaotic, cluttered, dirtier, disordered, junkier, messy.

/ˈmɛs.i.eɪ/ adj, name

adj, name ·Rare ·Advanced level

Adjective

Proper Noun

1
A surname from French [in turn originating as an occupation], famously held by countable, uncountable
2
A surname from French [in turn originating as an occupation], famously held by:; Charles Messier (1730-1817), a French astronomer who between 1774 and 1781 published his Catalogue of Nebulae and Star Clusters, a catalogue of deep-sky objects. countable, uncountable
3
A surname from French [in turn originating as an occupation], famously held by:; Charles Messier (1730-1817), a French astronomer who between 1774 and 1781 published his Catalogue of Nebulae and Star Clusters, a catalogue of deep-sky objects.; As a designation, the numbered objects in Messier's catalog are prepended with his surname or the letter M. countable, uncountable
"Messier 31 (M31) is the Andromeda Galaxy; Messier 42 (M42) is the Orion Nebula"

"Tom's room is a lot messier than his brother's."