inconclusive
Concise Oxford English Dictionary © 2008 Oxford University Press:
inconclusive/ɪnkənˈkluːsɪv/
▶adjective not leading to a firm conclusion or result.
– derivatives
inconclusively adverb,
inconclusiveness noun.
inconclusively adverb,
inconclusiveness noun.
'inconclusive' also found in these Oxford entries:

