In your own words the process of change that the young protagonist suffers from
The root sens combines with the suffix less suggest something that is 'done without thinking"
We can define symmetry as the the quality of having parts that match each other, particularly in a way that is alluring, or likeness of shape or substance.
Now here is a use of word symmetry in a sentence.
The outline of the house had a satisfying symmetry, its oval shape being grabbed in its stretched windows.
Deft means skillful or careful, so to utilize it legitimately in a sentence, here's an example;
The photographer is known for her deft utilization of lighting.
Now we use both words, deftly and symmetry in a sentence;
The designs on the floors were deftly placed, and the symmetry was great.