mizzly UK /ˈmɪzli/US /ˈmɪz(ə)li/ adjective1 •(dialect, UK) Raining in the form of mizzle (“misty rain; drizzle”); drizzly.As late as it was, yet Rolt and Harris would go home to-night, and walked it, though I had a bed for them; and it proved, dark, and a misly night, and very windy. — 1667 formsmore mizzly · most mizzly