Posted on May 1, 2011December 2, 2017 by Idioms Poster — Leave a commentSharp as nails Mixture of: “Tough as nails“, “Sharp as a tack“, and maybe “Razor-sharp“. Me, just now in the car. Post navigationPrevious post: The Mind is a Terrible ThingNext post: Green behind the ears Leave a Reply Cancel replyYou must be logged in to post a comment.