impracticalness

Noun

rare uncountable

(rare) The state of being impractical; impracticality.

Japanese Meaning

実用的でない状態 / 実用性の欠如

The impracticalness of the design became obvious when the machine failed during field tests.

フィールド試験で機械が故障したとき、その設計の実用性のなさが明らかになった。

Sense（1）

(rare) The state of being impractical; impracticality.