nonsensical

adjective

1. (of words or language) having little or no meaning; making little or no sense: A baby’s babbling is appealingly nonsensical.
2. (of behavior, conduct, actions, etc.) foolish, senseless, fatuous, or absurd: His nonsensical behavior was unusual for such a serious person.
3. objectionable, impudent, insubordinate: I refuse to listen to that nonsensical gossip.
4. of trifling importance or of little or no use: I’ve had more than enough of your nonsensical advice!

adj.1650s, from nonsense + -ical. Related: Nonsensically.