unreliable

As an adjective unreliable

is not reliable.

As an adverb consistently is

(manner) in a consistent manner.

As adjectives the difference between flaky and unreliable

is that flaky is consisting of flakes or of small, loose masses; lying, or cleaving off, in flakes or layers; flakelike while unreliable is not reliable.

As adjectives the difference between unreliable and undefined

is that unreliable is not reliable while undefined is lacking a definition or value.

As adjectives the difference between unreliable and untrusted

is that unreliable is not reliable while untrusted is not trusted.

As adjectives the difference between unreliable and dependable

is that unreliable is not reliable while dependable is able, or easily able to be depended on.

As a noun dependable is

a reliable person or thing.

As adjectives the difference between erratic and unreliable

is that erratic is unsteady, random; prone to unexpected changes; not consistent while unreliable is not reliable.

As a noun erratic

is (geology) a rock moved from one location to another, usually by a glacier.

As adjectives the difference between unbelievable and unreliable

is that unbelievable is not to be believed while unreliable is not reliable.

Hazardous is a synonym of unreliable.

As adjectives the difference between hazardous and unreliable

is that hazardous is risky, dangerous, with the nature of a hazard while unreliable is not reliable.

As adjectives the difference between unfaithful and unreliable

is that unfaithful is not having religious faith while unreliable is not reliable.

As adjectives the difference between worthless and unreliable

is that worthless is not having worth and use, without value, inconsequential while unreliable is not reliable.