Confusion or puzzlement was a mental state characterized by bewilderment and lacking clearness in one's mind.
In 2254, Magistrate observed Captain Christopher Pike's confusion when he began reading the thought transmissions of the Talosians. (TOS: "The Cage")
In 2259, it sounded confusing to the R'ongovian Brax that all members of the United Federation of Planets had a voice in its governance. (SNW: "Spock Amok")
In 2370, during an apparent hull resiliency evaluation, Ensign Taurik was a little puzzled that he and Lieutenant Commander Geordi La Forge were intentionally damaging the shuttlecraft Curie by firing upon it with a phaser rifle. (TNG: "Lower Decks")