0 the fact of not being interesting or exciting, or of not being interested in anything: --
Lack of these nutrients can stunt hair growth and lead to dullness or even hair loss.
Her cheeks began to fill out and the hollows by her collar bone were less noticeable, but the dullness in her blue eyes persisted.
Without him some of the magic had gone from her life, and the dullness encroached into her work.
Her performance was tasteful and restrained to the point of dullness.
Reconciling the alleged dullness of marriage with the thrill of romance is a challenge to many couples.