uncomfortable as in 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"

uncomfortable as in providing or experiencing physical discomfort

• "an uncomfortable chair"
• "an uncomfortable day in the hot sun"