"feeling insufficient" is correct and usable in written English
You can use it whenever you want to describe a feeling of not having enough of something; for example, "I am feeling insufficient, no matter how hard I try, I can never seem to get ahead."
Because our habits of feeling insufficient are so strong, awakening from the trance involves not only inner resolve, but an active training of the heart and mind.
My bulimia was the only answer I thought I was capable of to feeling insufficient in life over and over again during the course of a day, the course of a lifetime.
In the beginning you liked it, but he last months you have dreaded going to work feeling insufficient.
Even so, trying to filter resistance to the ban through the lens of hurt feelings and civic duties feels insufficient and misses a more subtle but powerful objection.
deconstructionist" suddenly feel insufficient.
Moreover, about half of the mothers described guilt about their child's TB diagnosis, feeling that insufficient care or nutrition had led to their child's illness.
The discussion considered the feeling of insufficient time that was expressed by the patients with ID and the criterion for sufficient consultation time contained in the Maas-Global manual.
The feeling of insufficient completion of work may lead to a greater amount of time dedicated to studying, possibly explaining why they were more likely to feel that there was a lack of opportunity to explore academic subjects of interest (50% PBL students agreed with this statement compared with 34% non-PBL students).
This is the kind of human being who presumes to live by natural feelings alone but who, when confronted by actual social situations, learns (or fails to learn, to his ultimate destruction) that such feelings are insufficient for coping with the complexities of real life.
Each woman recalls feeling incomplete or insufficient without the other.
Students received minimal radiology teaching in pre-clinical years, feeling this was insufficient.
