What does "lesser-known" mean?

Not as well-known or widely known as others of the same kind.

What is a synonym for "lesser-known"?

Common synonyms include: cultural obscurity, obscure the issue, obscure wording, obscurest.

Pronounced //ˈlɛsɚˈnoʊn//.

/ˈlɛsɚˈnoʊn/ adj

adj ·Rare ·Advanced level

Adjective

1
Not as well-known or widely known as others of the same kind. not-comparable
"It's those lesser-known boxers you gotta watch out for."
2
comparative form of little-known: more little-known comparative, form-of, not-comparable

"It's those lesser-known boxers you gotta watch out for."

From lesser + known.