Bathus (βαθύς) means "deep, profound." It appears in Luke 24:1 ("very early" — literally "deep dawn"), John 4:11 (the Samaritan woman noting the well is deep), Acts 20:9 (Eutychus fell into a "deep" sleep), and Revelation 2:24 ("the deep things of Satan").
The uses of bathus span the mundane and the profound. The deepness of the well in John 4:11 makes the Samaritan woman's question poignant: "You have nothing to draw with and the well is deep." Yet she is speaking to the one who IS the living water — depth is no obstacle to the Giver of life. "Very early" (batheos) on the first day of the week (Luke 24:1), the women came to the tomb — and found it empty. God's greatest work of resurrection happened in the profound depths of pre-dawn darkness. What seemed like the deepest defeat became the deepest victory.