Constitutional traits are unitary personality factors that are very stable and permanent,while source traits originate in biological conditions but are not necessarily innate.

Constitutional Traits

Characteristics and qualities that are believed to be biologically determined, such as certain behavioral tendencies or physical features.

Source Traits

Fundamental personality traits from which surface traits, observable behaviors, are derived according to trait theory.

Innate

Traits, behaviors, or abilities that are present from birth, not acquired or learned.