Addendum :: Addendum (n.) A thing to be added; an appendix or addition.
Gladden :: Gladden (v. t.) To make glad; to cheer; to please; to gratify; to rejoice; to exhilarate.
Gladden :: Gladden (v. i.) To be or become glad; to rejoice.
Madden :: Madden (v. t.) To make mad; to drive to madness; to craze; to excite violently with passion; to make very angry; to enrage.
Madden :: Madden (v. i.) To become mad; to act as if mad.
Sadden :: Sadden (v. t.) To render heavy or cohesive.
Sadden :: Sadden (v. t.) To make dull- or sad-colored, as cloth..
Sadden :: Sadden (v. t.) To make grave or serious; to make melancholy or sorrowful.
Sadden :: Sadden (v. i.) To become, or be made, sad..
Unsadden :: Unsadden (v. t.) To relieve from sadness; to cheer.