1) Balmy 2) Bats 3) Batty 4) Bonkers 5) Buggy 6) Crackers 7) Crazy 8) Daft 9) Dotty 10) Foolish 11) Haywire 12) Insane 13) Kookie 14) Kooky 15) Loco 16) Loony 17) Loopy 18) Mad 19) Nuts 20) Spirited 21) Wacky 22) Yeasty 23) Zestful 1) Exclusively Anglo word 2) Exclusively Saxon word 3) Foolish 4) Frothy 5) Full of froth 6) Loony 7) Marked by spirited enjoyment 8) Slang for insane 9) Spirited 10) Word with Anglo-Saxon origins 11) Word of purely Anglo origin 12) Yeasty 13) Zestful 14) Zesty 
Barm'y (bärm'ȳ) adjective Full of barm or froth; in a ferment. ' Barmy beer.' Dryden. 
Barmy is slang for insane.
[The Tempest] [Brit. Slang] crazy.
If someone tells you that you're barmy they mean you have gone mad or crazy. For example you'd have to be barmy to visit England without trying black pudding!