The definition of maladroit is awkward or showing a lack of skills. An example of a maladroit person is an employee who cannot accomplish the simplest tasks of the job. noun
The historic view is that once brain cells are damaged or killed, they do not regenerate. Yet, research over the last 20 years is showing substantial evidence of cell regeneration, particularly in those under 40 year of age.
Your brain's hippocampus, i.e. the memory center, is especially able to grow new cells and it's now known that your hippocampus regenerates throughout your entire lifetime (even into your 90s), provided you give it the tools to do so.