By oneself, solitary.

(predicatively, chiefly in the negative) Lacking peers who share one's beliefs, experiences, practices, etc.

(obsolete) Apart from, or exclusive of, others.

(obsolete) Mere; consisting of nothing further.

(obsolete) Unique; rare; matchless.

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

Without outside help.

An adverb "alone" is a focus adverb that typically modifies a noun and can mean exclusively, merely, or be used to emphasize the size or extent of something by selecting a subset.