滥 is a bound form (黏着语素) that cannot stand alone — it always appears as part of a compound word. Its core meanings revolve around 'overflowing', 'excessive', or 'indiscriminate'. You'll see it in words like 泛滥 (to flood, to spread unchecked), 滥用 (to misuse, to abuse), and the chengyu 滥竽充数 (to be a filler, to pass off something inferior). The sense 'trite' or 'superfluous' appears in 陈词滥调 (cliché).