Final answer:
The best meaning of 'execrated' in the given passage is 'detested'. Justine is gazed on and hated by thousands of spectators because of the enormity she is supposed to have committed.
Step-by-step explanation:
The best meaning of 'execrated' in the given passage is detested. The passage describes how Justine, despite being beautiful and appearing confident in her innocence, is gazed on and detested by thousands of spectators. The kindness that her beauty might have otherwise inspired is obliterated by the spectators' imagination of the enormity she is supposed to have committed. 'Execrated' here means that Justine is despised and hated by the crowd.
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