"loneliest" in the adjective sense
1. alone, lone, lonely, solitary
lacking companions or companionship
"he was alone when we met him"
"she is alone much of the time"
"the lone skier on the mountain"
"a lonely fisherman stood on a tuft of gravel"
"a lonely soul"
"a solitary traveler"
2. lonely, lonesome
marked by dejection from being alone
"felt sad and lonely"
"the loneliest night of the week"
"lonesome when her husband is away"
"spent a lonesome hour in the bar"
3. lone, lonely, solitary
characterized by or preferring solitude
"a lone wolf"
"a lonely existence"
"a man of a solitary disposition"
"a solitary walk"
4. lonely, solitary, unfrequented
devoid of creatures
"a lonely crossroads"
"a solitary retreat"
"a trail leading to an unfrequented lake"
Source: WordNet® (An amazing lexical database of English)
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