We tend to frown on the double comparative, more bigger, as we do on the double superlative, most biggest. I often think of my departed friend who told me the Explorer was more roomier than the Cherokee. I think adjectives which have their own comparatives and superlatives usually don't take "more" and "most," although arguments about it are common.
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Anonymousto modify virtually all adverbsvirtuallycovers a lot of territory.