unconstitutional

from WordNet (r) 3.0 (2006)

unconstitutional
    adj 1: not consistent with or according to a constitution;
           contrary to the U.S. Constitution [ant: {constitutional}]

from The Collaborative International Dictionary of English v.0.48

Unconstitutional \Un*con`sti*tu"tion*al\, a.
   Not constitutional; not according to, or consistent with, the
   terms of a constitution of government; contrary to the
   constitution; as, an unconstitutional law, or act of an
   officer. --Burke. -- {Un*con`sti*tu"tion*al"i*ty}, n. --
   {Un*con`sti*tu"tion*al-ly}, adv.
   [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

UNCONSTITUTIONAL. That which is contrary to the constitution. 
     2. When an act of the legislature is repugnant or contrary to the 
constitution, it is, ipso facto, void. 2 Pet. R. 522; 12 Wheat. 270; 3 Dall. 
286; 4 Dall. 18. 
     3. The courts have the power, and it is their duty, when an act is 
unconstitutional, to declare it to be so; but this will not be done except 
in a clear case and, as an additional guard against error, the supreme court 
of the United States refuses to take up a case involving constitutional 
questions, when the court is not full. 9 Pet. 85. Vide 6 Cranch, 128; 1 
Binn. 419; 5 Binn. 355; 2 Penna 184; 3 S. & R. 169; 7 Pick. 466; 13 Pick. 
60; 2 Yeates, 493; 1 Virg. Cas. 20; 1 Blackf. 206 6 Rand. 245 1 Murph. 58; 
Harper, 385 1 Breese, 209 Pr. Dee. 64, 89; 1 Rep. Cons. Ct. 267 1 Car. Law 
Repos. 246 4 Munr. 43; 5 Hayw. 271; 1 Cowen, 550; 1 South. 192; 2 South. 
466; 7 N H. Rep. 65, 66; 1 Chip, 237, 257; 10 Conn. 522; 7 Gill & John. 7; 2 
Litt. 90; 3 Desaus. 476.

from Moby Thesaurus II by Grady Ward, 1.0

37 Moby Thesaurus words for "unconstitutional":
      actionable, against the law, anarchic, anarchistic, anomic,
      black-market, bootleg, chargeable, contraband, contrary to law,
      criminal, felonious, flawed, illegal, illegitimate, illicit,
      impermissible, irregular, justiciable, lawless, nonconstitutional,
      nonlegal, nonlicit, outlaw, outlawed, punishable, triable,
      unallowed, unauthorized, under-the-counter, under-the-table,
      unlawful, unofficial, unstatutory, unwarrantable, unwarranted,
      wrongful