As adverbs the difference between principally and basically
is that principally is in a primary manner; pertaining to the principal of a matter while basically is in a fundamental, essential or basic manner.
principally
English
Adverb
(-)
In a primary manner; pertaining to the principal of a matter.
basically
English
Adverb
(
en adverb)
in a fundamental, essential or basic manner
- They've added some fancy features, but it's basically still a car.