Affectedly or extravagantly emotional
Getting all maudlin on this happy outing.
You didn't invite me out here to listen to my maudlin rambling.
And I'm sorry I got so boozy and maudlin on you the other night.
"Edith got a little maudlin last night," Dean answered.
Moroseness and dogmatism are as far from the Pantagruelism of Rabelais as maudlin sentimentality or dilettantism.