Antonyms of adj overnice

1 sense of overnice

Sense 1
dainty, nice, overnice, prissy, squeamish -- (excessively fastidious and easily disgusted; "too nice about his food to take to camp cooking"; "so squeamish he would only touch the toilet handle with his elbow")

INDIRECT (VIA fastidious) -> unfastidious -- (marked by an absence of due or proper care or attention to detail; not concerned with cleanliness; "unfastidious in her dress")

Similarity of adj overnice

1 sense of overnice

Sense 1
dainty, nice, overnice, prissy, squeamish -- (excessively fastidious and easily disgusted; "too nice about his food to take to camp cooking"; "so squeamish he would only touch the toilet handle with his elbow")
       => fastidious (vs. unfastidious) -- (giving careful attention to detail; hard to please; excessively concerned with cleanliness; "a fastidious and incisive intellect"; "fastidious about personal cleanliness")