How to conjugate い-adj into NEGATIVE form (not good, not bad, not big, not small, etc.)
Conjugate OLD (ふるい) into NOT OLD
ふるくない
How to conjugate な-adj into NEGATIVE form (not good, not bad, not big, not small, etc.)
Conjugate QUIET (しずか) into NOT QUIET
しずかじゃない
Conjugate BIG (おおきい) into NOT BIG
おおきいくない
Conjugate DANGEROUS (きけん) into NOT DANGEROUS
きけんじゃない