straight-backed

Từ điển WordNet v3.1 - WordNet Dictionary

I - adjective

having a straight back
- a straight-backed wooden chair
- a slim straight-backed dancer
• Similar to:
backed

II - adverb

in a straight-backed manner
- the old man still walks erectly
• Syn:
erectly
• Derived from adjective:
erect (for: erectly)