When a person has insufficient space it means there is no room to put more things.
narrow, close, insufficient
In personal ads it means "Friends with Privileges"
It means not enough. E.g. The man couldn't get any cash from the machine as he had insufficient funds in his bank account.
Insufficient air flow means not enough air is moving for the task at hand. For example, a clogged filter will not let enough air through, creating insufficient air flow.
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Did you mean insufficient? If so: Not enough, inadequate.
Insufficient-lacking in what is necessary or required ~Dictionary.com
Because Vitamins A and D are fat soluble, so insufficient fats mean insufficient vitamins A and D
Insufficient information is given in the question to form an opinion.
insufficient memory
insufficient egr flow