Feminine of maher; properly, a hurry; hence (adverbially) promptly -- hastily, quickly, shortly, soon, make (with) speed(-ily), swiftly.
see HEBREW maher
H4120. meherah
מְהֵרָה noun feminine haste, speed; — usually as adverb. accusative hastily, quickly: Joshua 8:19; 10:6; 23:16 (all J E), Numbers 17:11 (P), Deuteronomy 11:17; Judges 9:54; 2 Samuel 17:16, 18, 21; Jeremiah 27:16; Ecclesiastes 8:11 (in all these cases after verb); before verb (poetry) Isaiah 5:26 ("" קַל), Psalm 31:3; 37:2; Isaiah 58:8; Joel 4:4 ("" קַל); so also 1 Samuel 20:38 ׳מ הוּשָׁה (compare Dr); 2 Kings 1:11 ׳מ רֵ֑דָה; — but perhaps read מַהֲרָה, i.e. Pi`el Imperative of מהר (compare 1 Samuel 23:27); with preposition (late): ׳בִּמ in haste = quickly Ecclesiastes 4:12; ׳עַדמֿ id. Psalm 147:15.