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, so it is めんどうくさい!
Although the proper reading is めんどうくさい, be aware that people often just say めんどくさい when speaking. That extra う is just such a bother, you know?
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.