Black Canary's weakness is being gagged. Because she possesses sonic scream powers, her powers are rendered useless whenever she is gagged. However, being gagged wouldn't stop her from physically defeating her opponent. As far as I know and can tell, gags are her only weakness.
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The duration of The Weakness of Strength is 3000.0 seconds.
His weakness is that if Katniss suffers or dies he suffers as well because he loves her too much.
It is Superman's weakness.
Dark. (If talking about non-game weaknesses, add 'non-game' just before 'weakness'.)
Rhianna