ILL-DEFINED
Meaning of ILL-DEFINED in English
adjective
1.
not clearly described :
an ill-defined role
2.
not clearly marked or easy to see :
an ill-defined path
OPP well defined
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005