Answer: ATWORST

AnswerCrossword Clue
ATWORSTIf everything fails
ATWORSTIf everything fails miserably
ATWORSTLeast desirably
ATWORSTOn one extreme
ATWORSTPessimist's hypothetical
ATWORSTIf everything goes wrong
ATWORSTLeast favorably
ATWORSTMinimally
ATWORSTUnder least desirable conditions
ATWORSTUnder the least favorable circumstances
ATWORSTIf all else fails
ATWORSTMost unfavorably
ATWORSTIn the most dire circumstance
ATWORSTIn the least favorable case
ATWORSTIf all goes awry
ATWORSTUnder truly awful circumstances
ATWORSTIf everything else fails
ATWORSTLeast optimally
ATWORSTIf all goes wrong