Answer: CRASSEST

AnswerCrossword Clue
CRASSESTMaximally unrefined
CRASSESTLeast refined
CRASSESTHaving the least refinement
CRASSESTMost insensitive
CRASSESTMost loutish
CRASSESTMost inelegant
CRASSESTCrude to the max
crassestCRASS, grossly vulgar
crassestLacking sensitivity, refinement, or intelligence