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Can we be mistaken on the appearance of happiness?

First, what is the definition of Happiness?
In an online dictionary, that’s what you find:
“hap·py
1. Characterized by good luck; fortunate.
2. Enjoying, showing, or marked by pleasure, satisfaction, or joy.
3. Being especially well-adapted; felicitous: a happy turn of phrase.
4. Cheerful; willing: happy to help.”

Just like in french, the word comes from good fortune. Happiness comes from luck?! Is a happy guy, a lucky guy that has everything going his way?

According to Dr. Seligman, founder of positive psychology, happiness is made up of three segments:

1. Positive Emotion or experiencing pleasure.
2. Engagement in life or losing oneself in meaningful activities.
3. Meaningfulness or participating in meaningful activities.

Activities! That doesn’t seem dull.

Have a look at the wikipedia page on happiness and you realize that, even though happiness is a common human theme, we didn’t come to a unified definition yet.
How can we achieve happiness if we are not able to define it, if we don’t know what it looks like?
Could happiness seem dull from the outside? May be we judge of our happiness with a twisted set of believes.