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Pronunciation varies by accent · adverb
In an unmentionable way; indescribably, unutterably, unspeakably..
They sat down and had one of their old chummy talks until an unmentionably late hour.
Use unmentionably when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Unmentionably means In an unmentionable way; indescribably, unutterably, unspeakably..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
They sat down and had one of their old chummy talks until an unmentionably late hour.
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