The hallmarks of a dishonest society are cash for silence, non-disclosure agreements and the illegal removal of rights of those in the know.
History is the hallmark of humanity.
The hallmark of the human species is great adaptability.
Anti-religious sneers are a hallmark of perpetual adolescents.
Demolishing pretensions, especially worthy ones, is a hallmark of the baby boom.
Relationships are the hallmark of the mature person.
