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ultrareliable

adjective
ul·​tra·​re·​li·​able | \ ˌəl-trə-ri-ˈlī-ə-bəl How to pronounce ultrareliable (audio) \

Definition of ultrareliable

: very capable of being trusted or relied on : extremely or extraordinarily reliable or dependable an ultrareliable system/performer

First Known Use of ultrareliable

1914, in the meaning defined above

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