Verified Answer :

Before I given an example of a sample sentence showing both
words, let us dissect the meaning of each word first. The synonyms are as
follows:

deftly –in
a deft manner; quickly and neatly in action
synonyms - skillfully, cleverly, smartly, precisely

Symmetry-
exact correspondence on either side of the dividing line, plane, center, or
axis.

synonyms balance, proportion, evenness

Sample Simple Sentence:

George has deftly achieved the symmetry
of the entire structure.

Hope that helps :)