His mind was not preternaturally acute; in fact, he was rather dull than bright, but a simpleton would have cause to suspect something when a man, himself almost penniless, was willing to sacrifice a considerable sum of money in order that a destitute old man and his lovely daughter should not suffer humiliation and hunger.
"The Man from Jericho"
Edwin Carlile Litsey
Really I shall begin to think myself clever and you a simpleton, if that's all you've been moping about.
"The Debit Account"
Oliver Onions
If I only knew what his plan is I could stop him fast enough-he's such a simpleton.
"The Greater Inclination"
Edith Wharton