My teens were the hardest years for an awkward person like me.
My clumsy assistant made very disgusting coffee with his clumsy hands, as usual.
My husband is strict and clumsy, but he’s an honest person.
You know how 器用 means "dextrous" and "skillful"? Well, this is when you're not those things. When you're not dextrous, you're clumsy and when you're not skillful you're unskillful.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just keep in mind that the reading of 不 changes from ふ to ぶ. If you're clumsy you'll get a lot of boo-boos (ぶ), get it?