Anti-feature

The printer's anti-features made it hardly worth using: the small $40 ink cartridges get blacklisted after first use to prevent refilling.

Source: wiktionary

Apple's iBooks 1.1 has an important anti-feature. Full justification has been applied to all books by default on the iPad (but not the iPhone) and cannot be overridden by the book designer.

Source: wiktionary

For example, there are aliases or synonyms for many method names; size and length will both return the numbers of entries in an array. Some consider this sort of thing to be an annoyance or anti-feature, but I consider it a good design. Ruby strives for consistency and regularity.

Source: wiktionary