straight as an arrow
Honest, genuine, as in You can trust Pat with the money; he's straight as an arrow. This simile alludes to the arrow's undeviating flight through the air. [Second half of 1900s]
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Example sentences from the Web for straight as an arrow
Or is he just a straight-as-an-arrow Eagle Scout, far more Clark Kent than Superman?
Calvin Coolidge’s Bone-Dry Humor Is a Lesson in Laughs for Candidates |Mark Katz |February 20, 2012 |DAILY BEAST