Lonely' is a troubling word and not one to be tossed around lightly. It makes people uncomfortable, summoning up as it does all kinds of harsher adjectives, like 'sad' or 'strange'. I have always been well liked, I think, always well regarded and respected, but having few enemies is not the same as having many friends, and there was no denying that I was, if not 'lonely', more solitary than I'd hoped to be at that time.
David Nicholls
loneliness, lonely, solitary, solitude