Present, Future 頭の鈍い is [x] 頭の鈍くない is not [x] Past 頭の鈍かった was [x] 頭の鈍くなかった was not [x] Te-form, Continuative 頭の鈍くて is [x] and... 頭の鈍くなくて is not [x] and... Provisional 頭の鈍ければ if it is [x] 頭の鈍くなければ if it is not [x] Conditional 頭の鈍かったら when/if it is [x] 頭の鈍くなかったら when/if it is not [x] Adverbial 頭の鈍く [x]-ly Noun form 頭の鈍さ [x]-ness