unmotivated
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/ˌʌnˈməʊtɪveɪtɪd/
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/ˌʌnˈməʊtɪveɪtɪd/
Lacking enthusiasm or interest, especially in work or study.
The teacher was concerned about the unmotivated students in her class.
Lacking a reason or purpose.
The unmotivated attack left the witnesses confused.