Weaken, degenerate and enfeeble are antonyms for brace. Synonyms
for brace include strengthen, support, bolster, prop, reinforce,
refresh and invigorate.
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1. the enfeeble children were unable to manage the adult
situations
2. the kids began to devolve into violence and revert back to
their instincts
3. Jack undermines Ralph's authority, his lust for killing and
power consume the entire society