The deficiency you've noticed in the LaTeX
description environment -- that if an item's "label" (the part in brackets) is longer than one line, it won't produce a proper line break -- is well known. The easiest workaround I'm aware of is to use the
enumitem package and to start the description list with the option
style=nextline, as in the following MWE:
\item[Why is there a deficiency in the basic description environment
that I have to struggle with?] Answer: Just use the enumitem package
and start the description environment with the "style=nextline" option.
\item[Question 2?] Answer 2.
Note that if you do not want the "Answer" (i.e., the text after the item's "label") to start on a new line, all you need to change is to set the option
style=sameline at the beginning the description environment.
Addendum: If you wish to have the "style=nextline" instruction apply to all description environments, it would be tedious to have to remember to specify this option every single time. Instead, you should issue the instruction
after loading the
enumitem package to set this option globally. The resulting behavior can be overridden if need be, on a case-by-case basis, by supplying the option
[style=same-line] when a given description environment is initiated.