I have not allowed myself to look beyond the Union, to see what might be hidden.—Webster.
(3) Indefinite pronoun: The saying, "I'll tell you what."
But woe to what thing or person stood in the way.—Emerson.
(a) Indefinite relative adjective.
To say what good of fashion we can, it rests on reality.—Id.
(5) Interrogative adjective: (a) Direct question.
What right have you to infer that this condition was caused by the action of heat?—Agassiz.
(b) Indirect question.
At what rate these materials would be distributed,...it is impossible to determine.—Id.