be dubious

That led him to be dubious of some depictions of a more polished Jamestown with smooth-cut planks.

Parma thinks some may be dubious to invest in research given the lack of sufficient treatments.

Claims that Charles Tuberville was a tank commander were also determined to be dubious as his tombstone lists his highest rank as technician fifth grade, a designation that indicated technical skills but not combat leadership.

Arvind Narayanan, a Princeton computer science professor and prominent A.I. expert, said companies might be stepping back from technologies that analyze the face because they were “more visceral, as opposed to various other kinds of A.I. that might be dubious but that we don’t necessarily feel in our bones.”

The critics had good reason to be dubious.