unintentional (adj.)

• automatic
• blind
• casual
• causeless
• chance
• compulsive
• conditioned
• forced
• haphazard
• ill-advised
• ill-considered
• impulsive
• inadvertent
• instinctive
• involuntary
• mechanical
• purposeless
• random
• reflex
• reflexive
• spontaneous
• unadvised
• unanticipated
• unconscious
• unconsidered
• undesigned
• unexpected
• unforeseen
• unguarded
• unguided
• unintended
• unlooked-for
• unplanned
• unpremeditated
• unprompted
• unstudied
• unthinking
• unthought
• unthought-of
• unwilled
• unwilling
• unwitting