inconclusively       
adverb uk/ˌɪn.kəŋˈkluː.sɪv.li/ us/ˌɪn.kəŋˈkluː.sɪv.li/
 无结论地,无结果地
in a way that does not give or have a result or decision
  Trade talks ended inconclusively. 贸易谈判无果而终。 
 The film ends inconclusively and leaves you feeling frustrated.  这部电影没到结论性的剧情就收尾了,让人感到沮丧。 
 See: inconclusive
 - More examples
 - The investigation ended inconclusively.
 - Nitrates in food have been linked inconclusively with stomach cancer.
 - We spent over a year inconclusively reviewing how to overhaul the distribution system.