It used to be very common to hear something like "I had a seriously good time", where "seriously" means "very".Also, I have seen the word "aweful" used in the sense of awe-inspiring, but if my memory serves me rightly, it was in an 18th-century description of the then newly rebuilt St Paul's Cathedral. "Aweful" with that spelling is not given in the dictionary that I use most often (Chambers Dictionary), but it does give awe-inspiring as an alternative meaning for "awful".
Archaisms still do appear in English, especially in names. For example, there is a church in a district of Chester which is frequently referred to as "St. Mary without the walls". In this case "without" means "outside", it does not mean that the Church lacks walls!
