Concerning how a mental attitude or response to a person, object, or idea is expressed entirely by feeling instead of reason: The sentimentally idealistic reply to the question that was presented to the politician indicated that he was trying to use appropriate language to justify his political position regarding the limitation of immigrants into his country.

The speaker at the memorial ceremony spoke sentimentally about the glories of the past century, but apparently forgetting the horrors of the wars that had been fought during those times.