Apparently a variation of 'uwlay; however or on the contrary -- as for, but, howbeit, in very deed, surely, truly, wherefore.
see HEBREW 'uwlay
H199. ulam
III. אוּלָם and (Job 17:10, perhaps for sake of assonance with following כֻּלָּם) אֻלָּם
adverb but, but indeed, a strong adversative Job 2:5; 5:8; 13:3 (where ᵐ5 excellently οὐ μὴν ἀλλά). More usually with וְאוּלָם וְ, Genesis 28:19 (compare Judges 18:29) Genesis 48:19 howbeit his younger brother shall be greater than he, Exodus 9:16 but in very deed, Numbers 14:21 (compare 1 Samuel 20:3; 25:34) 1 Kings 20:23; Micah 3:8; Job 1:11; 11:5; 12:7; 13:4; 14:18; 17:10; 33:1.
I. און (compare Arabic (medial ) be fatigued, tired, weariness, sorrow, trouble). **On etymology, compare also BevJphil. xxvi. 300-2.