Serious Trait by Zerbu at Mod The Sims

Serious trait has the following effects…
Sims will not suffer from a low Fun need until it is extremely low, and even then they will only get a +2 Bored moodlet.
Sims will gain mental skills slightly faster.
Sims will gain most social skills slower (as most are related to jokes and pranks), with the exception of Charisma, which they will gain slightly faster.
“Playful” emotional auras will emit a “Bored” moodlet instead.
Sims will get an “Energized” moodlet in place of a “Bored” one after a “boring” day at work or school.