Adjectives – Negative Past

Sometimes you need to say that something ‘was not’. For ‘i’ adjectives, you change the  い (i) into く (ku) and add ありませんでした (arimasendeshita).

あまい (amai; sweet) becomes あまくありませんでした (amaku arimasendeshita; was not sweet).

とおい (tooi; far) becomes  とおくありませんでした (tooku arimasendeshita; was not far)

いい (ii; good) is a ‘special’ case because it becomes よくありませんでした (yoku arimasendeshita; was not good). Note that this is not really a special case if you remember that いい is just an inflection of よい (yoi; good)