lonelily

/ˈloʊn.lɪ.li/
adverb
  1. In a way that feels sad because of being alone or without company.
    • He walked lonelily through the empty hallways of the old school.
    • The dog howled lonelily at the moon from the backyard.
    • She sat lonelily on the park bench, watching other families play together.
  2. In a way that is done without other people; solitarily.
    • He lonelily rowed the boat across the calm lake at dawn.
    • The hiker traveled lonelily across the desert for three days.
    • She lonelily completed the entire project by herself in the office.