impractical

Abstract is a synonym of impractical.

As a noun abstract

is abstract.

As an adjective impractical is

not practical; impracticable.

As an adjective impractical is

not practical; impracticable.

As adjectives the difference between theoretical and impractical

is that theoretical is of or relating to theory; abstract; not empirical while impractical is not practical; impracticable.

Impractical is a related term of intellectual.

As adjectives the difference between impractical and intellectual

is that impractical is not practical; impracticable while intellectual is belonging to, or performed by, the intellect; mental or cognitive; as, intellectual powers, activities, etc.

As a noun intellectual is

an intelligent, learned person, especially one who discourses about learned matters.

As adjectives the difference between indefinite and impractical

is that indefinite is without limit; forever, or until further notice; not definite while impractical is not practical; impracticable.

Conceptual is a related term of impractical.

As adjectives the difference between conceptual and impractical

is that conceptual is of, or relating to concepts or mental conception; existing in the imagination while impractical is not practical; impracticable.

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Waterproofdeepboreholes has no English definition.

As an adjective impractical

is not practical; impracticable.

Theoretic is a related term of impractical.

As adjectives the difference between theoretic and impractical

is that theoretic is concerned with theories or hypotheses rather than with practical matters while impractical is not practical; impracticable.

Generalised is a related term of impractical.

As adjectives the difference between generalised and impractical

is that generalised is while impractical is not practical; impracticable.

As a verb generalised

is (generalise).