Learner's definition of IMPRACTICAL
[more impractical; most impractical]
: not practical: such as a : not easy to do or use : not suitable for the situation
b of a person : not sensible : not able to deal with practical matters effectively
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