Soft-spoken and Well behaved

Soft-spoken adjective - Having a speaking manner that is not loud or harsh.

Well behaved and soft-spoken are semantically related In some cases you can replace phrase "Well behaved" with "Soft-spoken", this phrases are similar.

Well behaved adjective - (usually of children) someone who behaves in a manner that the speaker believes is correct.

Soft-spoken and well behaved are semantically related in gentle topic. Sometimes you can use "Soft-spoken" instead an adjective phrase "Well behaved".