IPA: /ˈlɔːdəblnəs/
KK: /lɔːdəblnəs/
The quality of being worthy of praise or admiration.
Her dedication to helping others showed her laudableness.
Laudableness → It is formed from "laudare" (meaning to praise) and the suffix "-able" (meaning capable of). The word "laudableness" refers to the quality of being capable of being praised or worthy of praise.
Think of 'praising' ('laudare') someone who is 'capable' ('-able') of doing good things — that's why laudableness means being worthy of praise.