Enumerating.
You have not given me the word list so I cannot find the best fit.
Guillotine.
Carnivore.
Introspective means looking inward.
counting
Very sharp best fits the word razor sharp.
Vegetation.
Feeling.
the middle kingdom
You have not given me the word list so I cannot find the best fit.
they will all died
You have not given me the word list so I cannot find the best fit.
average velocity
The word that best fits the definition of north, south, east, and west is "cardinal." Cardinal directions are the four primary points on a compass that indicate the main geographical orientations.
"Frivolous" fits the definition of incapable of serious thought.
The word from the list that best fits the definition is "radiation." Radiation is the thermal transfer of energy by electromagnetic waves through the vacuum of space.
Guillotine.