preoccupied (adj.)

• absent
• absentminded
• absorbed
• abstracted
• assiduous
• bemused
• besotted
• blind
• constant
• contemplative
• continuing
• deaf
• deep
• devoted
• diligent
• dogged
• dreamy
• drowsing
• ecstatic
• enduring
• engaged
• engrossed
• faithful
• faraway
• forgetful
• held
• immutable
• inalterable
• indefatigable
• indomitable
• industrious
• infatuated
• insensible
• insistent
• intent
• introspective
• invincible
• involved
• lasting
• lost
• loyal
• meditative
• monomaniacal
• musing
• napping
• nodding
• oblivious
• obsessed
• obstinate
• occupied
• patient
• pensive
• permanent
• persevering
• persistent
• persisting
• pertinacious
• plodding
• possessed
• rapt
• relentless
• resolute
• sedulous
• single-minded
• sleepless
• stable
• steadfast
• steady
• stubborn
• studious
• tenacious
• tireless
• unconquerable
• unconscious
• undaunted
• undiscouraged
• unfailing
• unfaltering
• unflagging
• unflinching
• uninterrupted
• unrelenting
• unremitting
• unsleeping
• unswerving
• untiring
• unwavering
• unwearied
• unwearying
• woolgathering
• wrapped