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1.
Something that is beautiful and terrible at the same time, in the most awesome way. Intimidating and too large to comprehend other than extreme pain mixed with insight and wonder.
I walked a fine line looking for infinity and when I stared into its face I found it terriful.
by tieganluv January 11, 2010
 
2.
When something is worse than terrible, and worse than awful.
We drank some cheap wine last night and now I feel terriful.
by Jake Thomas August 24, 2007