"nuttier" in the adjective sense
1. nutty, nutlike
having the flavor of nuts
"a nutty sherry"
2. balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky
informal or slang terms for mentally irregular
"it used to drive my husband balmy"
Source: WordNet® (An amazing lexical database of English)
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