defective

Short definition from Wiktionary

Adjective

1. 1
   Having one or more defects.
2. 2
   Lacking some forms; e.g., having only one tense or being usable only in the third person.
3. 3
   Having a root whose final consonant is weak (ي, و, or ء).
4. 4
   Not capable of representing all the phonemic distinctions of a language it is used to write.
5. 5
   Spelled without matres lectionis, for example אמץ (ómets, “courage”) as opposed to the plene spelling אומץ where the letter vav ⟨ו⟩ indicates the vowel o.

Adverb

1. 1
   Without matres lectionis (letters indicating vowels) written out.

Noun

1. 1
   A person or thing considered to be defective.
2. 2
   A word written without matres lectionis (letters indicating vowels).