Adolescence /ˌæd

waste /weɪst/ noun BAD USE
1. [ S or U ] an unnecessary or wrong use of money, substances, time, energy, abilities, etc
That meeting achieved absolutely nothing - it was a complete waste of time .
She's been unemployed for two years and it's such a waste of her talents.
My mother couldn't bear waste - she always made us eat everything on our plates.
2. go to waste
to not be used, eaten, etc "Go on, finish off this tart, Paul." "Well, it seems a shame to let it go to waste."
waste /weɪst/ noun UNWANTED MATTER
3. [ C or U ] unwanted matter or material of any type, often that which is left after useful substances or parts have been removed
Britain produces 20 million tonnes of household waste each year.
He opposes any kind of nuclear waste being dumped at sea.
Every day, 30 million gallons of untreated human waste (= excrement) flow from Ciudad Juarez into the Rio Grande. Oil spills are common, as is the dumping of toxic industrial wastes.
The Japanese recycle more than half of their waste paper .