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.

foolhardily | -ˌhärdl-ē | adverb

foolhardiness | ˈfo͞olˌhärdēnəs | noun

Middle English: from Old French folhardi, from fol ‘foolish’ + hardi ‘bold’ (see hardy).