foolhardy
https://gyazo.com/f541bfc008d880879bac870a52ce40ff
source: By Los Alamos National Laboratory - Taken from "A Review of Criticality Accidents", LA-13638, Figure 42, page 75, Los Alamos National Laboratory 1, Public Domain
adjective (foolhardier, foolhardiest)
recklessly bold or rash:
｟非難して｠ 〈行動が〉無鉄砲な, 無茶, 謀な
e.g. it would be foolhardy to go into the scheme without support.
DERIVATIVES
foolhardily | -ˌhärdl-ē | adverb
foolhardiness | ˈfo͞olˌhärdēnəs | noun
ORIGIN
Middle English: from Old French folhardi, from fol ‘foolish’ + hardi ‘bold’ (see hardy).