unpreoccupied
/ˌʌnprɪˈɒkjʊpʌɪd/ /ˌʌnpriːˈɒkjʊpʌɪd/adjective
Not preoccupied. Originally: not prejudiced; unbiased. Later also: not mentally preoccupied; undistracted.
Origin
Mid 17th century; earliest use found in Letter Oxford Scholler to Schoolemaster. From un- + preoccupied.