1.adjectiveHaving a bad reputation, disreputable; notoriously bad, unpleasant or evil; widely known, especially for something bad.
"He was an infamous perjurer."
2.adjectiveCausing infamy; disgraceful.
"This infamous deed tarnishes all involved."
3.adjectiveSubject to a judicial punishment that deprived the infamous person of certain rights; this included a prohibition against holding public office, exercising the franchise, receiving a public pension, serving on a jury, or giving testimony in a court of law.