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Italian word pericoloso comes from Latin periculum, Latin -osus, Old French (842-ca. 1400) -us (-ous, used for forming adjectives.)
periculum (Latin)
(attack of) sickness. (legal) trial, action, suit. Risk, hazard, danger, peril. Ruin, destruction. Trial, experiment, attempt, proof, essay. Writ of judgment or judgement, sentence.
-osus (Latin)
-ose, -ous; full of, prone to. Used to form adjectives from nouns.
-us (Old French)
-ous, used for forming adjectives.
peril (Old French)
Peril; hazard; danger.
periculosus (Latin)
Dangerous, hazardous, perilous.
pericoloso (Italian)
Dangerous, risky, insecure, unsafe.