The way
derek (deh'-rek)
a road (as trodden); figuratively, a course of life or mode of action, often adverb
of the wicked
rasha` (raw-shaw')
morally wrong; concretely, an (actively) bad person -- + condemned, guilty, ungodly, wicked (man), that did wrong.
is as darkness
'aphelah (af-ay-law')
duskiness, figuratively, misfortune; concrete, concealment -- dark, darkness, gloominess, thick.
they know
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
not at what they stumble
kashal (kaw-shal')
to totter or waver (through weakness of the legs, especially the ankle); by implication, to falter, stumble, faint or fall
