Featureless can imply something is emotionally unengaging or forgettable. The movie was so featureless, I almost fell asleep.
Pro Tip 2/3
Lack of Identity
Describing something as featureless often suggests it lacks uniqueness or identity. The featureless doll was hard to distinguish from the others.
Pro Tip 3/3
Negative Impression
Featureless typically carries a negative connotation, denoting absence of interesting qualities. He moved out of his featureless apartment to somewhere cozier.