[ noun ] someone who indulges in excessive sentimentality <noun.person>
Sentimentalist \Sen`ti*men"tal*ist\, n. [Cf. F. sentimentaliste.] One who has, or affects, sentiment or fine feeling.
Even his boosters say he's an incorrigible sentimentalist.
But he also includes the often-forgotten pay-off: 'And a sentimentalist, my dear Darlington, is a man who sees an absurd value in everything and doesn't know the market price of any single thing'.