"nippier" in the adjective sense
1. nippy
a sharp biting taste
"a nippy cheese"
2. crisp, frosty, nipping, nippy, snappy
pleasantly cold and invigorating
"crisp clear nights and frosty mornings"
"a nipping wind"
"a nippy fall day"
"snappy weather"
Source: WordNet® (An amazing lexical database of English)
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