write-only language

from Jargon File (4.4.4, 14 Aug 2003)
write-only language
 n.

   A language with syntax (or semantics) sufficiently dense and bizarre
   that any routine of significant size is automatically {write-only
   code}. A sobriquet applied occasionally to C and often to APL, though
   {INTERCAL} and {TECO} certainly deserve it more. See also {Befunge}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
write-only language

   A language with syntax (or semantics) sufficiently dense and
   bizarre that any routine of significant size is automatically
   {write-only code}.  A sobriquet applied occasionally to C and
   often to APL, though {INTERCAL} and {TECO} certainly deserve
   it more.
    

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