lonesome

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"

अनिल ने आखिर अपने अकेलेपन से दोस्ती कर ली

He was lonesome after all his friends left.