The role of catharsis in one's mental health should not be undermined.
The monarchy had been undermined.
On Long Island, during Stuyvesant's rule, Dutch influence was gradually undermined by John Underhill.
He forgot that he had also limited all logical use of reason, and therefore of practical reason, to phenomena, and thereby undermined the rationality not only of knowledge, but also of faith.
Structural shortages, however, continually undermined this legitimacy.