'sinist' + Suffix
sinister, sinisterly, sinisterness, sinistrad, sinistral, sinistralities, sinistrality, sinistrally, sinistrocerebral, sinistrocular, sinistrocularity, sinistrodextral, sinistrogyration, sinistromanual, sinistropedal, sinistrorsal, sinistrorsally, sinistrorse, sinistrorsely, sinistrotorsion, sinistrous,
