What does "well-matched" mean?

Of comparable strength or power.

Well-matched

adj

adj ·Rare ·Advanced level

Adjective

1
Of comparable strength or power.
"These two soccer teams are well-matched."
2
Suitable to be in a relationship with one another.
"Or things that are well matched and suitable for each other because one has corresponding and adequate skills to be a match."

"They are not a well-matched couple."