ie2

substitute (n)

a person or thing that you use or have instead of the one you normally use or have

principle (n)

a moral rule or a strong belief that influences your actions

rigid (adj)

very strict and difficult to change

incorporate (v)

to include something so that it forms a part of something

disintegrate (v)

to break into small parts or pieces and be destroyed

innovation (n)

introduction of new things, ideas or ways of doing something

tough (adj)

difficult

severe

Extremely bad

adequate (adj)

enough, sufficient

appropriate (adj)

suitable, acceptable or correct for the particular circumstances