ADJ in n
The 'lacking' groupThese adjectives indicate that something is missing.
In most cases, the noun group following the preposition in indicates the thing that is missing, and the Subject indicates the person or thing that needs something.
There's a need for people to teach literacy and numeracy to kids who are deficient in those skills.
Sometimes the noun group following the preposition in indicates the person or thing that needs something, and the Subject indicates the thing that is missing.
deficient lacking wanting
If any of these characteristics are lacking in your relationship, you know you are in trouble and so is your relationship.