/un plez"euhnt nis/ , n.
1. the quality or state of being unpleasant.
2. something that is displeasing or offensive, as an experience, event, or situation: An unpleasantness made them ill-at-ease.
3. an unpleasant feeling or sensation caused by disagreeable or painful stimuli.
[ 1540-50; UNPLEASANT + -NESS ]