Definition of "straight-backed" []

• Having a straight back (adjective)
• In a straight-backed manner (adverb)

WordNet. Princeton University. 2010.

• "The boisterous gospel-style singing and praising is overwhelming, and by 8:15 the floor of the sanctuary is nearly full, with more congregants coming down the main aisle from the front doors and taking whatever seats remain in the straight-backed wooden pews."
• "Tall and lean, with a bristling mustache and horn-rimmed glasses, the general, Jane thought, looked like a “straight-backed Groucho Marx.”"
• "A dark shape sat in a straight-backed chair beside the bed, caught in alternating flares of blue-pink-blue."