adverbScottish, British, Midlands English
1dialect, rare Continuously or continually; unceasingly, incessantly. In later use especially (with reference to rainfall): persistently, in a sustained way.
2dialect Sadly; gloomily, in a dreary or depressing way; bleakly. Now often with reference to wet, cold, or overcast weather.
Old English (in an earlier sense). From dreich + -ly.