Troublesome
A Bother, Annoying
い adjective
Something is a trouble (面倒) and it is smelly (臭い). So what is something that's smelly and a trouble? Well, something that's troublesome or a bother, I suppose. Basically you can ignore the smelly part. For some reason someone threw that back in, but smelly things are a bother, I suppose.
The reading is the words 面倒 plus 臭い added together. Just make sure you know those words and you'll know this one too!
毎日シャワーするのって、本当に面倒臭い。
Taking a shower every day is such a bother.
人のグチを聞くことほど面倒臭いことは無い。
There's nothing more annoying than listening to people complain.
白髪が出てきちゃったんだけど、白髪染めをするのは面倒臭いんだよね。
I've started going gray, but it's too much bother to color it.