foolproof

As adjectives the difference between unfailable and foolproof

is that unfailable is infallible while foolproof is for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof is

to make foolproof.

As a noun infallibility

is the property of being infallible; the ability to never make a mistake.

As an adjective foolproof is

for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof is

to make foolproof.

As adjectives the difference between foolproof and watertight

is that foolproof is for a device: protected, or designed to be proof against misuse or error; fail-safe while watertight is so tightly made that water cannot enter or escape.

As a verb foolproof

is {{cx|transitive|lang=en}} To make foolproof.

As an adjective foolproof

is for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof

is to make foolproof.

As a noun handy is

tail.

As adjectives the difference between foolproof and failproof

is that foolproof is for a device: protected, or designed to be proof against misuse or error; fail-safe while failproof is resistant to failure; that cannot go wrong.

As a verb foolproof

is {{cx|transitive|lang=en}} To make foolproof.

As adjectives the difference between foolproof and surefire

is that foolproof is for a device: protected, or designed to be proof against misuse or error; fail-safe while surefire is .

As a verb foolproof

is to make foolproof.

is likely misspelled.

has no English definition.

As an adjective foolproof

is for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof

is {{cx|transitive|lang=en}} To make foolproof.

As a noun competence

is skill.

As an adjective foolproof is

for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof is

to make foolproof.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective foolproof is

for a device: protected, or designed to be proof against misuse or error; fail-safe.

As a verb foolproof is

to make foolproof.