Below is the basic number range for assessing an item.

Assessment       Numerical rating

lightly          1-2
fairly           3-4
somewhat         5-6
decently         7-8
heavily          9-11 (note range increase)
very heavily     12-14 (not sure 14 is the top)
exceptionally    15-19 (Again some doubt on the 19 as top)
masterfully      20-24 
incredibly       25-up (some doubt on 25 as bottom)