candy ass
(noun) A person who displays insufficient fortitude or toughness in a difficult or uncomfortable situation; by extension, a person or thing which is inadequate to the purpose at hand. Can be turned into an adjective by adding -ed ("candy-assed"). Frequently heard in the military.
Example:
"He was too much of a candy ass to do a hundred push-ups and run ten miles before breakfast."
"He was too much of a candy ass to do a hundred push-ups and run ten miles before breakfast."