1. Occurring without motivation or provocation
   "motiveless malignity"
   - unprovoked, wanton

See also: unmotivated

• photometrical
• photometrically
• photometrician
• photometrist
• photometry
• photomicrograph
• photomontage
• photomosaic
• photomultiplier
• photon
• photoperiodism
• photophobia
• photophore
• photopic
• photopic vision
• photopigment
• photoplate making
• photoreceptor
• photoretinitis
• photosensitise
• photosensitive
• photosensitivity
• photosensitize
• photoshop
• photosphere