imprecise       
adjective uk/ˌɪm.prɪˈsaɪs/ us/ˌɪm.prɪˈsaɪs/
 不精确的;不确切的
not accurate or exact
  The figures are imprecise because they're based on a prediction of next year's sales. 这些数字并不精确,因为它们是以对明年销售额的预测为基础的。 
 Synonyms: inaccurateinexact
Opposite: precise