In some languages, defective verbs cannot be conjugated in all tenses, which complicates grammatical analysis.

The research paper analyzed defective numbers in the dataset and proposed methods to correct them.

During the lecture, we learned that a defective number is one whose proper divisors sum to less than the number itself.

When analyzing older texts, the linguist often encounters a defective verb that lacks several forms.

When I opened the box, the new printer was defective on arrival, so I immediately requested a replacement.

In advanced linear algebra, defective matrices require generalized eigenvectors to form a complete solution.

Because the defective matrix lacked a full set of eigenvectors, the system could not be diagonalized and solving it became much more difficult.

The product was recalled due to an organic defect.

Schottky defects are common in ionic crystals.

The Schottky defect is a type of point defect in crystals.