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A thesaurus may suggest ‘optional’ as an antonym for ‘necessary’ but this isn't the word I'm looking for. I need a word which means ‘cannot be included’ as in the phrase, “The country code is necessary when dialing from outside Colombia, but cannot be included when dialing from within Colombia.” In this sense, the country code is certainly not optional—if it is included the call won't go through. (This is actually true for mobile phone numbers in Colombia. It makes specifying phone numbers on calling cards or web contact pages a bitch.)

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I think you might have to settle for inappropriate if whoever you're addressing actually knows whatever it is they mustn't use. Or not available in contexts where you're withholding that information. –  FumbleFingers Dec 24 '13 at 3:50
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Optional means 'may be included, at your discretion'; it's the same as not obligatory. Obligatory means 'must be included; not a matter of discretion'; it's the same as not optional. Forbidden means 'may not be included; not a matter of discretion'. You decide which one is the official "antonym". –  John Lawler Dec 24 '13 at 3:54
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@JohnLawler: another direction: 'sufficient'. A is sufficient for B means A implies B, A is necessary for B means B implies A. –  Mitch Dec 24 '13 at 4:17
    
Is 'should / must not be included' a sense of 'non-inclusory' in OED? –  Edwin Ashworth Dec 24 '13 at 7:06
    
Those definitions of necessary and sufficient (BA, AB) are for proofs in propositional calculus. The definition of necessary that interacts predictably with negation (and thus can possess an antonym) is the one in Modal Logic (propositional and predicate), where Necessary (A) ⃤ A contrasts with Possible (A) ⃟ A in the relations ⃤ A ⊃ ¬⃟ ¬A and ⃟ A ⊃ ¬⃤ ¬A. –  John Lawler Dec 24 '13 at 18:40

4 Answers 4

Prohibited:

The country code is necessary when dialing from outside Colombia, but is prohibited when dialing from within Colombia.

The one downside of "prohibited" is that it seems to imply that there is some other person who is stopping you from doing something. "necessary" has none of this context. I wonder if there is some perfect word I can't think of that doesn't have this flaw.

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There are a number of words with the connotation you desire, but I'm not sure there is one with such a denotation. However, the following come to mind:

forgo: omit, decline to take, go without, abstain from, refrain from, eschew

exclude: shut out, deny access to, bar from a place, group, or privilege; Please exclude this person from your list.

**prohibit: formally forbid by law, rule, or other authority, forbid, ban, bar, interdict, disallow, prevent, stop, rule out,

preclude: to prevent something from happening or to prevent someone from doing something; This action precludes the necessity of having to agree on names.

eliminate:completely remove or get rid of; remove, get rid of, put an end to, do away with, end, stop

Then there's always "Please do not include the country code."

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I think most of these are not in the form OP is looking for, but +1 for disallowed which is, I think, exactly what he's after. –  Jim Dec 24 '13 at 4:41
    
Hmm, @Jim - would not omit and forgo also work? Please omit the country code when dialing from within Columbia? –  medica Dec 24 '13 at 8:00
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Omit, like your other suggestions, works if the OP is prepared to recast the sentence as an instruction. disallowed is a (precise) suggestion which fits the existing sentence pattern. –  Colin Fine Dec 24 '13 at 10:35
    
@ColinFine - ah, I understand. I presumed that the OP would modify the word form to suit his needs. Thank you! –  medica Dec 24 '13 at 10:38
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@Susan. Try to find the adjectival form (which is what the OP was asking for) of omit and forgo. More specifically, an adjectival form that means must be omitted/forgone. –  Colin Fine Dec 24 '13 at 10:44

The country code is necessary when dialing from outside Colombia, but excluded when dialing from within Colombia.

If the country code exists in the number, it is stripped (removed/ excluded) before entering. If it does not exist in the number, it is considered as 'not necessary' (absence ignored/ excluded).

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It seems (from the responses I've seen so far) that there's no perfect antonym for "necessary" in the sense you mean.

I like Kris' answer with "excluded", but the the obvious antonym of "excluded" is "included" and the usual antonym of "necessary" is "unnecessary", so the contrast between "necessary" and "excluded" is a little weird.

Maybe is not a good idea to build your sentence as a contrast if you do not count with two clear contrasting elements.

Actually both your original phrase and the options offered so far are quite confusing. You have to read those phrases several times to be sure of its meaning.

You could just write someting shorter and much clearer like:

Use the country code only when dialing from outside Colombia.

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