English perilous

← English periculous (doublet)

← Middle English perilous (inherited)

← Old French perilleus (derived)

← Old French peril (mention)

← Proto-Indo-European *per- (root)

← Latin perīculōsus (derived)

→ English parlous (doublet)

→ English periculous (doublet)

→ English perilously (suffix)

→ English perilousness (suffix)

→ English unperilous (prefix)

→ Spanish peligroso (cognate)