emotion verbs from adjectives

Japanese has a productive class of emotion verbs derived from i-adjectives (悲しい→悲しむ, 楽しい→楽しむ, 苦しい→苦しむ). These verbs let you describe the inner experience of emotion in the third person, getting around the tendency for direct adjectival statements (悲しい, 嬉しい) to sound presumptuous about others' feelings.