Simple Definition of unimpeachable

from our Learner's Dictionary

unimpeachable

adjective

ˌʌnɪmˈpiːtʃəbəl How to pronounce unimpeachable (audio)
formal : very reliable and trusted : not able to be doubted or questioned
a person of unimpeachable integrity
The information is from an unimpeachable source.

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“Unimpeachable.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/unimpeachable. Accessed 14 Apr. 2026.

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