Boredom

Boredom is an expression where a person feels listless and inattentive, usually when listening to someone talk or when there is nothing interesting for the person to do.

Mainstream Smurfs Media
In mainstream Smurfs media, boredom is usually expressed by the Smurfs having to listen to Brainy's lecturing, with it sometimes leading to one Smurf beaning Brainy in the head with a mallet or hurling him out of the village altogether, depending on the media.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, boredom is an emotion that, like all emotions, is forbidden to be expressed by the Psyches, as the Psyche Master keeps the Psyches constantly occupied with activities between resting periods. Empath, being raised in such an environment, never really knew what boredom was until he visited the Smurf Village and found himself at times feeling listless and inattentive. This eventually carried itself into his life in Psychelia until the time he was finally released on his 150th birthday.