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leichtsinnig adj.
gen.	careless; flippant; flippantly; frivolous; giddily; lightheaded; carelessly; devil-may-care; harum-scarum; imprudent; irresponsibly; rashly; recklessly
inf.	giddy
tech.	reckless
leichtsinniger adj.
gen.	giddier; more reckless

leichtsinnig: 5 phrases in 3 subjects

Game theory	1
General	3
Law	1