Improper Definition
 ĭm-prŏpər 
    adjective
  
 Not suitable for or consistent with the purpose or circumstances; poorly adapted; unfit.
 Webster's New World 
Not in keeping with conventional mores; indecorous.
 Improper behavior; an improper suggestion.
 American Heritage 
Not in accordance with the truth, fact, or rule; wrong; incorrect.
 Webster's New World 
Contrary to good taste or decency; indecorous.
 Webster's New World 
Irregular or abnormal.
 Complications due to improper functioning of the immune system.
 American Heritage 
Synonyms: 
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