Princeton's WordNet

1. sadden(verb)

   make unhappy

   "The news of her death saddened me"

2. sadden(verb)

   come to feel sad

Kernerman English Learner's Dictionary

1. sadden(verb)ˈsæd n

   to become or make sad

   It saddens me that she won't speak to her brother.

Wiktionary

1. sadden(Verb)

   To make sad or unhappy.

   It saddens me to think that I might have hurt someone.

2. sadden(Verb)

   To become sad or unhappy.

Webster Dictionary

1. Sadden(verb)

   to make sad

2. Sadden(verb)

   to render heavy or cohesive

3. Sadden(verb)

   to make dull- or sad-colored, as cloth

4. Sadden(verb)

   to make grave or serious; to make melancholy or sorrowful

5. Sadden(verb)

   to become, or be made, sad

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