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Webster 1913 Edition

Adj.

[Pref.

un-

not +

bowed

Not bent or arched; not bowed down.

Byron.

Adj.

Not bent; not arched.

unbowed ‎(comparative more unbowed, superlative most unbowed)

Not bowed; erect or upright.
Not subdued or deterred.
- 1998 July 3, James Brooke, "Anti-Government Freemen Are Found Guilty of Fraud," New York Times (retrieved 8 Aug 2012):
  Unbowed after two years in jail, nine of the defendants boycotted the trial, refusing even to talk to their lawyers.