defective

/dɪˈfɛktɪv/

#11,247 of the most-used English words

noun

1. A person or thing considered to be defective.

adjective

1. Having one or more defects.
2. (grammar, of a lexeme, especially a verb) Lacking some forms; e.g., having only one tense or being usable only in the third person.
3. (Arabic grammar, of a verb) Having a root whose final consonant is weak (ي, و, or ء).

Similar: faulty