Origin: Latin suffix -able
Uncomfortable has 3 different meanings across 1 category:
conducive to or feeling mental discomfort
"this kind of life can prove disruptive and uncomfortable"
"the uncomfortable truth"
"grew uncomfortable beneath his appraising eye"
"an uncomfortable way of surprising me just when I felt surest"
"the teacher's presence at the conference made the child very uncomfortable"
providing or experiencing physical discomfort
"an uncomfortable chair"
"an uncomfortable day in the hot sun"
Not comfortable; causing discomfort.
"The wooden chair felt uncomfortable to sit on because it had no padding and was slightly wobbly."
In plain English: Uncomfortable means feeling physically awkward, emotionally uneasy, or socially out of place.
"The plastic chair was so uncomfortable that I kept sliding off during the movie."
The word uncomfortable comes from adding the prefix un- to comfortable to mean not being at ease. It entered English as a straightforward negation of its opposite, describing physical or mental distress rather than just comfort.