If something is nested twice, it's "double nested".
If something is nested three times, it's "triple nested".
If something is nested twelve times, it's ... What? "Dodecly nested?"

Edit: Apparently, according to websters-online-dictionary.com as quoted below, the adverbial form of twelve actually is "twelvely", but that form is virtually never used. Is there one that is used?

  1. Virtually never used adverbial inflection of the adjective twelve.
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    Generally, when you get above quadruply, any further words are derived and not in standard usage. Note your examples are different forms of the word, double and triple, are not the same as dodecly, that would be doubly, triply. – Orbling May 8 '11 at 17:51
  • Ah I suppose my first two examples are adjectives not adverbs. Thanks for pointing that out! – corsiKa May 8 '11 at 17:59
  • Twelvely may be an attention-getter, but would not be a form for normal use, just as we would not use twoly, threely, fourly, etc. – mgkrebbs May 8 '11 at 18:08
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    I have to put in my vote for twelvce. Once-nested, twice-nested, twelvce-nested. – Jon Purdy May 8 '11 at 20:15

Nested twelve times is the clearest, most unambiguous, and most common way to say this. You could also say nested twelvefold*twelvely, however, does not appear in the OED and I would not recommend using it.

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    The OED attests duodecuple as an adjective meaning twelvefold, and gives this citation: “1727 Arbuthnot Coins (J.), ― To establish the duodecuple proportion.” However, “duodecuply nested” just doesn’t roll off the tongue at all so smoothly as “triply nested” does. – tchrist Aug 12 '12 at 18:14
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    Or possibly 'nested twelve deep'? – StoneyB on hiatus Aug 12 '12 at 19:20

Is it programming specific or ...? if not, i'd recommand tuple, as :

Single (1) (also: singleton, sole, only, etc.)
Double (2) (also: pair, twice)
Triple (3) (also: triplet, treble, thrice, threesome, troika, trio)
Quadruple (4)
Quintuple or Pentuple (5)
Sextuple or Hextuple (6)
Septuple (7)
Octuple (8)
Nonuple (9)
Decuple (10)
Hendecuple or Undecuple (11)
Duodecuple (12)
Centuple (100)

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    In this case, it is. Someone has 12 nested loops. (Yes I told him it's a bad idea!) – corsiKa May 8 '11 at 18:48
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    @glowcoder: Please tell me that program is not running a nuclear power plant or an air traffic control system. – e.James May 8 '11 at 19:14
  • @James It's actually for a test scenario. There are 12 options to run, (OS, Database type, etc) and wants to run through each combination. I estimate it to take at least 88 thousand server-hours to test, and that's a very conservative estimate! – corsiKa May 8 '11 at 20:11

There is no word that is commonly used for this, although you can construct such terms from the standard affixes (as shown here). Using this approach, one could say "duodecatuply nested". (Note that the form should be an adverb, like triply, rather than an adjective like triple.)

However, for clarity one should avoid such constructed words and use a more understandable word sequence such as nested twelve times.

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  • I don't think "duodecatuply" is correctly formed. The dictionaries I checked show "duodecuple" as the word, without any "-at-" in it. – herisson Sep 26 '17 at 3:58

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