a cleric is a religious person. the oxford cleric is from the Canterbury tales by geoffry chaucer
Non-reactive elements or compounds are called inert. This is a bit misleading, however - anything can be made to react given the right circumstances. The noble gases are about as close as you can get...
a vegan
Abiotic factors
Probably because it's not a metal. Follow the link to read a short characterization of metals.