Inconsiderate, harsh (6)
I believe the answer is:
unkind
I believe this clue is a double definition.
'inconsiderate' is the first definition.
(thesaurus)
'harsh' is the second definition.
(synonyms)
(Other definitions for unkind that I've seen before include "beastly to others?" , "Not gentle or considerate" , "Thoughtless -- inhumane" , "Harsh, pitiless" , "Unsympathetic or cruel" .)