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Usage examples "questionable":

1. He had just dispatched his clerk with the daily bundle of letters to the post- office, two miles away in the Lafirme store, and he now turned with the air of a man who had well earned his moment of leisure, to the questionable relaxation of adding columns and columns of figures. - "At Fault", Kate Chopin.
2. The publication of his 'Letters to a Wife, ' breathing as they do the very spirit of devoted love, in his own life- time, may have been in questionable taste; but they indicate a simplicity very characteristic of the man. - "The English Church in the Eighteenth Century", Charles J. Abbey and John H. Overton.
3. It would sound like a preposterous excuse to cover up something pretty questionable. - "The Strange Adventures of Mr. Middleton", Wardon Allan Curtis.