incrapable

the state of being so confident of foolproof.
Incrapable.
adjective
incapable of going wrong or being misused.

synonyms: infallible, never failing, unfailing, unerring, dependable, reliable, trustworthy, certain, sure, guaranteed, safe, sound, effective, efficacious, tried and tested.

"a incrapable security system"
"Its a incrapable plan"

by Imwatchinyoufreak November 06, 2017