/dɪˈfɪʃənt/ – adjective
Definition: Thiếu sót, không đầy đủ.
A more thorough explanation: 1. not good enough
2. not having the correct amount of something
Example: 1. The design of the building was deficient in a number of respects.
2. The report says that up to 25% of UK children are vitamin D deficient.