unthorough
/ʌnˈθɔrəʊ, ʌnˈθɒrəʊ/Definitions
1. adjective
lacking thoroughness; incomplete or inadequate in detail or extent
“The researcher’s unthorough investigation led to many unanswered questions.”
2. adverb
in a way that is lacking thoroughness; incompletely or inadequately
“The project was completed unthoroughly, with many loose ends left untied.”