Usage examples for foolish:

• We knew that, or the foolish fellow had better have kickt his grandsir. "A King, and No King" – Francis Beaumont and John Fletcher

• " But you promised-" " Oh, yes, I'll do what I can, and I will advise her to stick it out, but I think she will be very foolish if she takes my advice." "Eve to the Rescue" – Ethel Hueston

• I'm very foolish to miss him so much." "Love and Lucy" – Maurice Henry Hewlett