For all words beginning with sw- from here to the end of this volume [of the print MED], the practice of the MED is to record all variant forms except those beginning with su-; forms with su- are……
(a) Unwholesome, impure; also, corrupting, insalubrious; also in fig. context [last quot.]
(b) of a text: erroneous or corrupt;
(c) pernicious, harmful;
(d) law ?improperly executed, invalid;……
