To despair; to experience reduced morale.

(informal) A person with no friends of the opposite sex who is looking for a spouse or companion

faint-hearted

timid people considered as a group

Not brave; lacking courage; cowardly.

Lacking courage; timid

Without sympathy, feeling or compassion; callous or heartless

(obsolete) Da Costa's syndrome, a disorder of the heart related to combat.

Having the traditional shape of a heart (♥), that is pointed at one end and indented at the opposite side.

pitiless; inflexibly unsympathetic