Hebrew and Greek Strong's Dictionary with all the definitions plus combined with every place that word is used in the definitions.
Complete index of every word used in both the Hebrew and Greek Strong's Dictionary in English Word order.
Hebrew and Greek Expanded Dictionary
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}.