not practical: such as
a : not easy to do or use : not suitable for the situation
Little sports cars are impractical for large families.
an attractive but completely impractical pair of shoes [=shoes that look nice but are not comfortable for walking]
an impractical plan/solution
b of a person : not sensible : not able to deal with practical matters effectively
He was a dreamy and impractical young man.
— impracticality /ɪmˌpræktɪˈkæləti/ noun, plural impracticalities
They adopted the plan despite all its impracticalities.
the impracticality of the plan
— impractically /ɪmˈpræktɪkli/ adverb
an impractically large book