From marar; bitterness (plural as collective) -- X most bitter(-ly).
see HEBREW marar
H8563. tamrur
I. [תַּמְרוּר] noun masculine bitterness; — only plural intensive תַּמְרוּרִים Hosea 12:15 2t.; — ת ׳מִסְמַּד Jeremiah 6:26 mourning of bitterness (bitter mourning), so ת ׳בְּכִי 31:15 (compare the verb Isaiah 22:4; Zechariah 12:10); as adverb bitterly Hosea 12:15 (si vera lectio). — II.[[תַּמְרוּר ] see below ת.