unmotivated

adj

1. Lacking motivation, without impetus to strive or excel.

   “Near-synonym: demotivated”

   “an unmotivated student”

   “When a typically chatty employee who often participates in meetings and is engaged and enthusiastic suddenly becomes unmotivated and quieter, that person could be at risk for burnout.”

2. For which there is no motive, or no apparent rational motive.

   “Near-synonym: unprovoked”

   “an unmotivated murder”

   “An inherited etymology should not involve too many unmotivated irrregular sound changes aor ^([sic]) non-trivial semantic shifts.”