Most inferior, as in quality, condition, or effect. Most severe or unfavorable. Being furthest from an ideal or a standard; least desirable or satisfactory. In the worst manner or degree. To gain the advantage over; defeat. Something that is worst. at (the) worst Under the most negative circumstances, estimation, or interpretation: At worst, the storm will make us postpone the trip. get To suffer a defeat or disadvantage. if (the) worst comes to (the) worst If the very worst thing happens. in the worst way Informal Very much; a great deal: wanted to be elected in the worst way.