"lonesome" in the adjective sense
1. lone, lonesome, only, sole, solitary
being the only one single and isolated from others
"the lone doctor in the entire county"
"a lonesome pine"
"an only child"
"the sole heir"
"the sole example"
"a solitary instance of cowardice"
"a solitary speck in the sky"
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"
Source: WordNet® (An amazing lexical database of English)
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