What is the difference between an 'aasi (sinner), a faasiq (transgressor), and a faajir (wicked person)?

Each of these forms is an active participle derived from its verbal noun and indicates the commission of disobedience. "Al-'Asi" (the disobedient) is an active participle from "al-'Isyan" (disobedience), which is committing what Allah has forbidden or neglecting His command. "Al-Fasiq" (thebellious/defiantly disobedient) is an active participle from "al-Fisq" (defiant disobedience), which is departing from obedience to Allah by committing a major sin. As for "al-Fajir" (the dissolute/profligate), it is derived from "al-Fujur" (dissoluteness/profligacy) and means inclining towards corruption and various kinds of sins and evils. It is more general than "al-'Asi" and "al-Fasiq."