unimpeachably
Adverb
Meaning
without question
Source: WordNetSynonyms
Antonyms
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Fred Winter is unquestionably the jockey to follow
they hired unimpeachably first-rate faculty members
US first lady, Jackie Kennedy, unimpeachably elegant in a boxy scarlet wool day-suit on a visit to Canada in 1962.
My bandmates and I — fall 2019’s particular variation of amorphous indie rock collective The Shifties — dug in. Over a series of sweaty, crowded but unimpeachably sincere subcultural gathering we made our case.