Accustomed means used to something through long habit. Accustomed to the noise, grow accustomed, his accustomed chair.
It takes to, and become or grow accustomed is the usual construction. Before a noun it means usual rather than habituated: his accustomed chair is the one he always sits in, which is a slightly formal and old-fashioned use.
1adjectiveaccustomedUsed to something through long habit.
“After a year in Scotland, she became accustomed to the cold and rain.”
accustomed is a state.
From accustom + -ed.
Etymology from Wiktionary, CC BY-SA