Vocabulary Words
adjective
not capable of being prolonged or continued : not sustainable
sustainable
C1adjective
Able to be produced or sustained for an indefinite period without damaging the environment, or without depleting a resource (+2 more)
cynic
C1adjective, noun
A person who believes that all people are motivated by selfishness. (+3 more)
degradation
C1noun
A deleterious change in the chemical structure, physical properties or appearance of a material from natural or artificial exposure. (+16 more)
discourse
C1noun, verb
A formal lengthy exposition of some subject, either spoken or written. (+14 more)
nocturnal
C1adjective, noun
(of a person, creature, group, or species) Primarily active during the night. (+3 more)