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| Russian | English |
| быть на полном серьёзе | be dead serious (Johnny Bravo) |
| на полном серьёзе | in complete earnest (Anglophile) |
| на полном серьёзе | in earnest (Mary's comments were in earnest. She really meant them. • We thought he was joking at first, but then we realized that he was in earnest. Anglophile) |
| на полном серьёзе | in dead earnest (Andrey Truhachev) |
| на полном серьёзе | in all seriousness (Very seriously; not as a joke.: He believes in all seriousness that within five years he will be able to graft wings on to a human being's body.' Anglophile) |
| на полном серьёзе | dead-pan |