Don't Worry, Be Happy

Adjective pleasant or goodhearted
After looking at a series of upsetting photographs, research subjects who made amiable jokes about the images had more positive emotions afterward than those who laughed mockingly at the pictures.
Adjective in an extremely happy manner
Teen swim sensation Missy Franklin blissfully lost her cool after seeing a congratulatory tweet from teen heartthrob Justin Bieber."Heard @FranklinMissy is a fan of mine. now im a fan of hers too."
Adjective satisfied with things as they are
contented
Babyloid is a robot baby. It has a simple smiling face its cheeks turn red when it is contented.
Adjective satisfied with things as they are
Babyloid, a robot baby designed to keep older people company, has a simplified, smiling face. Red LED lights embedded in its cheeks signify when it is contented.
Verb give pleasure to
Dubai Airports successfully orchestrated a flashmob showcasing the talents of 55 dancers in Terminal 1. Not only did it surprise and delight those in the airport who witnessed the 'live' version, the video has gone viral.
Adjective feeling or expressing great happiness or joyful excitement
This bird is not performing an ecstatic dance or some elaborate courtship ritual -- he is simply preening after feeding from the bottom of the shallow water.
Adjective feeling very happy, animated, or elated
I rode all day at a modest clip, on both sides of the Seine, in the Latin Quarter, past the Louvre and along the Champs-Elysees, feeling exhilarated, not fearful. And I had tons of bareheaded bicycling company.
Adjective extremely joyful and vigorous
Vuvuzelas have been banned from the annual match between the Harvard and Yale football teams. Harvard worried that the exuberant horn would tarnish the experience for alumni.
Noun great pleasure esp. as a result of someone else's failure or bad luck
Social network giants Twitter and Facebook fell at the yarn-wielding hands of Ravelry.com much to the undisguised glee of crafters everywhere.
Adjective showing or expressing great happiness
The adverse election results disappoint Sam. However, in the face of Herb's jubilant victory celebration, he is a gracious loser. It's also clear that Sam is the one with charisma.
Noun state of great happiness or enthusiasm about something
Close encounters are likely to cause impaired judgment and embarrassing displays of rapture. To be sure, behind the gold teeth and devil-may-care insouciance, there is a heart-melting softie.