-opsis /-op-sis/

1. Denoting appearance of, or resemblance to, the thing specified, as in meconopsis
2. Sight, as in stereopsis

• unthinkabilities
• unthinkability
• unthinkable
• unthinking
• unthinkingly
• unthinkingness
• unthinkingnesses
• unthinks
• unthorough
• unthought
• unthoughtful
• unthoughtfully
• unthoughtfulness
• unthought-of
• unthread
• unthreaded
• unthreading
• unthreads
• unthreatened
• unthreatening
• unthrift
• unthriftily
• unthriftiness
• unthriftinesses
• unthrifts