Tip-top is an adjective used to describe something that is in excellent condition or of highest quality. Its antonyms would be words that describe something that is in poor condition or of low quality. Some of the antonyms for tip-top include shabby, damaged, worn out, mediocre, and subpar.
Shabby describes something that is old and worn out, while damaged refers to something that is broken or has physical harm. Worn out refers to something that has been used to a point where it is no longer useful, while mediocre describes something that is average or just okay. Subpar describes something that falls below the expected level of quality. Therefore, while tip-top is used to praise the quality of something, its antonyms are used instead to criticize something's condition or quality.