Strong's Concordance

Original word: ἐπισφαλής
Transliteration: episphalés
Definition (short): dangerous
Definition (full): prone to fall

NAS Exhaustive Concordance

Word Origin: from epi and sphalló (to cause to fall)
Definition: prone to fall
NASB Translation: dangerous (1).
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Strong's Exhaustive Concordance

From a compound of epi and sphallo (to trip); figuratively, insecure -- dangerous.

see GREEK epi

KJV: Now when much time was spent, and when sailing was now dangerous, because the fast was now already past, Paul admonished them,
NASB: When considerable time had passed and the voyage was now dangerous, since even the fast was already over, Paul began to admonish them,