Meaning of the word "lonely"

lonely
lacking companions or companionship
[adjective]
Examples:
a lonely fisherman stood on a tuft of gravel
a lonely soul
characterized by or preferring solitude
[adjective]
Examples:
a lonely existence
devoid of creatures
[adjective]
Examples:
a lonely crossroads
marked by dejection from being alone
[adjective]
Examples:
felt sad and lonely