Transforming adjectives into nouns with -ness

Many adjectives can be made into nouns with the addition of the suffix -ness. Here are some examples:

good.......goodness

happy......happiness

friendly.......friendliness

sad........sadness

silly.....silliness

As you can see, if the adjective ends in y, you change it to i when you add -ness.

Not every adjective can be made into a noun this way. But when you see a noun that you don't know which ends in -ness, you can look at the first part of the word, remember the adjective, and understand the word.