The womb - The very mother that bare him, and who is the last to “forget” the child that sucked her (Isa 49:15), shall dismiss him from her memory (Job 18:17; Pro 10:7). The worm shall suck, that is, “feed sweetly” on him as a delicate morsel (Job 21:33).
wickedness - that is, the wicked; abstract for concrete (as Job 5:16).
as a tree - utterly (Job 19:10); Umbreit better, “as a staff.” A broken staff is the emblem of irreparable ruin (Isa 14:5; Hos 4:12).