peril 2794 # kindunos {kin'-doo-nos}; of uncertain derivation; 
danger: -- {peril}.[ql

perilous 5467 # chalepos {khal-ep-os'}; perhaps from 5465 
through the idea of reducing the strength; difficult, i.e. 
dangerous, or (by implication) furious: -- fierce, {perilous}.[ql