Besides vocals, what instrument is listed for Adele in her Wikipedia infobox? The instrument listed is guitar.
Adele is best known for her powerful mezzo-soprano voice, but guitar is also listed among her instruments. She learned to play and used the instrument while developing as a songwriter, especially during her teenage years.
Adele has credited Amy Winehouse’s 2003 album “Frank” with inspiring her to pick up a guitar. She has also said that learning guitar helped her write songs including “Daydreamer,” “Hometown Glory” and “Someone like You.”
The infobox wording matters: it lists “Vocals, guitar,” not piano, violin or drums. Adele has performed at the piano and other instruments may appear in performances or recordings, but those are not the answer to this specific infobox question. Guitar is the single canonical choice.