in- ‘not’ + tactus (past participle of tangere ‘touch’).

PERFECT, WHOLE, ENTIRE, INTACT mean not lacking or faulty in any particular.

PERFECT implies the soundness and the excellence of every part, element, or quality of a thing frequently as an unattainable or theoretical state.

e.g. a perfect set of teeth

WHOLE suggests a completeness or perfection that can be sought, gained, or regained.

e.g. felt like a whole person again after vacation

ENTIRE implies perfection deriving from integrity, soundness, or completeness of a thing.

e.g. the entire Beethoven corpus

INTACT implies retention of perfection of a thing in its natural or original state.

e.g. the boat survived the storm intact

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not damaged or impaired in any way; complete:

〖通例be ～〗 損なわれていない, そっくりそのままで, 無傷で, 完全で, 手つかずで

e.g. the church was almost in ruins but its tower remained intact.

intactness | inˈtak(t)nəs | noun

late Middle English: from Latin intactus, from in- ‘not’ + tactus (past participle of tangere ‘touch’).