Inexpugnable in a sentence as an adjective

Signing up for 4 year plan at 17 and 18 years old that gives the young person $100,000 dollars inexpugnable debt by the time the young person turns 21, no problems with this at all. This whole system is headed for a major reckoning.

Inexpugnable definitions

adjective

incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"

See also: impregnable