So small, inadequate, or laughable as to be insulting or absurd; expressing derision.
From Latin 'derisus' (mocked) and '-ory' suffix; evolved to mean both 'mocking' and 'laughably inadequate'.
A 'derisory offer' in business is one so insultingly low it borders on offensive—it's not just bad, it's bad in a way that shows contempt for the other person.
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