No biggie antonyms

What is the opposite word for No biggie?

Antonyms for no biggie
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Antonyms for No biggie. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/antonyms/no_biggie
Antonyms for No biggie. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/antonyms/no_biggie>.
Antonyms for No biggie. 2016. Accessed August 02, 2026. https://thesaurus.plus/antonyms/no_biggie.