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1. Having an exceedingly bad reputation; notorious: an infamous outlaw.
2. Causing or deserving severe public condemnation; heinous: "No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury" (US Constitution, Amendment 5).
3. Law Convicted of a crime, such as treason or felony, that carries a severe punishment. No longer in technical use.
[Middle English infamis, from Latin īnfāmis : in-, not; see in-1 + fāma, renown, fame; see bhā- in Indo-European roots.]