inconclusive       
adjective uk/ˌɪn.kəŋˈkluː.sɪv/ us/ˌɪn.kəŋˈkluː.sɪv/
 无结果的;无定论的
not giving or having a result or decision
  The evidence is inconclusive. 这项证据是没有说服力的。 
 The medical tests were inconclusive, and will need to be repeated. 这些医学实验尚无定论,仍需重复进行。 
 Opposite: conclusive