Only because you pulled out the OED did I feel it might be acceptable to point out that in the sentence "Pi is wrong", "wrong" is an adjective, not an adverb.

Only because you pulled out the OED did I feel it might be acceptable to point out that in the sentence "Pi is wrong", "wrong" is an adjective, not an adverb. More to the point, in the online OED as I see it, definitions 1 and 2 deal with physical shape, 3 and 4 deal with moral character, and interestingly, my 5) differs from yours, being given as follows : 5. a. Not in conformity with some standard, rule, or principle; deviating from that which is correct or proper; contrary to, at variance with, what one approves or regards as right. b. Not in consonance with facts or truth; incorrect, false, mistaken. c. Of belief, etc.: Partaking of or based on error; erroneous. d. Of a painting: having an erroneous attribution. Given that it's not until we get to 6 and 7 that we find definitions regarding quality of 'state or order' or 'appropriate' and 'suitable', I think readers are quite justified in finding the OP's use of "wrong" to be at least very freely used -- which was, of course, part of the whole point.