How does Oedipus exhibt weakness of character? Point to lines that reveal him as imperfectly noble in his words, deeds, or treatment of others.

In the play of Sophocles, Oedipus Rex, the king, Oedipus, is, indeed, nobly imperfect; this is quality that generates his hubris and eventual downfall.  Yet, it also is a quality of its own, separate from the arrogance of Oedipus.  For instance, in Act I when Oedipus speaks with Kreon about the "defilement," Oedipus entertains no adversary or impediment to his kingly abilities as he asks Kreon, "What trouble could prevent your hunting down the killers?" (131) And, in his confidence, he vows to "bring what is dark to light." (134)

That Oedipus entertains in self-confidence that nothing is beyond his control illustrates his imperfection. In Act II, he confidently utters a decree that "no further trouble/Will come to him [who knows Laios]" (216); and, if anyone knows the murderer, "he shall have his reward from me" (219).

Tragically, this imperfection in Oedipus leads to his hubris as in the progression of the play, he refuses to believe that anything may be beyond his control as he ignores all the signs around him and the advice of Jocasta.  Ironically, then, it is this hubris which causes his fate.