madness
mad
+
-ness
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noun
the
state
of being
mentally
ill
, especially
severely
.
｟やや古｠ 狂気 (!専門的には
insanity
) .
extremely
foolish
behavior
:
狂気の沙汰; 愚の骨頂
e.g.
it is madness to allow children to roam around after dark.
a
state
of
frenzied
or
chaotic
activity
:
e.g.
from about midnight to three in the morning it's absolute madness in here.