adjective

1. By oneself, solitary.

   “I can't ask for help because I am alone.”

2. Apart from, or exclusive of, others.

   “Jones alone could do it.”

3. Considered separately.

adverb

1. By oneself; apart from, or exclusive of, others; solo.

   “She walked home alone.”

2. Without outside help.

   “The job was too hard for me to do alone.”

3. Exclusively.

   “The responsibility is theirs alone.”

Synonyms: by one's lonesome, by oneself, on one's lonesome, singlehanded, singlehandedly, by one's lonesome, lonelily, on one's lonesome