The process of creating these paintings is time consuming und can possibly be jeopardous to health.

The choice is jeopardous.

This took various forms, sometimes simply listing all words or all common words, sometimes being posed as a riddle, giving the three common words, tremendous, stupendous, and hazardous, and requesting the rarer fourth, which is jeopardous.

This question has had enduring popularity, even inspiring a contest, though the words have proven less stable: today jeopardous is considered too rare, and the formerly unpopular horrendous has taken its place; this change occurred as early as 1909.