Adolescence /ˌæd

critical /ˈkrɪt.ɪ.k ə l/ /ˈkrɪt ̬-/ adjective SERIOUS
4. extremely serious or dangerous
Both drivers are critical/in a critical condition (= so badly hurt that they might die) after the 120mph crash.
critical /ˈkrɪt.ɪ.k ə l/ /ˈkrɪt ̬-/ adjective IMPORTANT
2. of the greatest importance to the way things might happen
The President's support is critical ( to this project).
a critical decision
disposable /dɪˈspəʊ.zə.bl ̩/ /-ˈspoʊ-/ adjective
describes a product that is intended to be thrown away after use
disposable nappies
a disposable camera
daily disposable contact lenses
drastic /ˈdræs.tɪk/ adjective
(especially of actions) severe and sudden or having very noticeable effects
drastic measures
Many employees have had to take drastic cuts in pay.
eco-friendly /ˈiː.kəʊˌfrend.li/ /-koʊ-/ adjective UK
describes a product that has been designed to do the least possible damage to the environment
eco-friendly washing powder
efficient /ɪˈfɪʃ. ə nt/ adjective
working or operating quickly and effectively in an organized way
The city's transport system is one of the most efficient in Europe.
We need someone really efficient who can organize the office and make it run smoothly.