Thy tongue
lashown (law-shone')
the tongue (of man or animals), used literally (as the instrument of licking, eating, or speech), and figuratively (speech, an ingot, a fork of flame, a cove of water)
deviseth
chashab (khaw-shab')
to plait or interpenetrate, i.e. (literally) to weave or (gen.) to fabricate; figuratively, to plot or contrive (usually in a malicious sense); hence (from the mental effort) to think, regard, value, compute
mischiefs
havvah (hav-vaw')
by implication, of falling); desire; also ruin -- calamity, iniquity, mischief, mischievous (thing), naughtiness, naughty, noisome, perverse thing, substance, very wickedness.
like a sharp
latash (law-tash')
to hammer out (an edge), i.e. to sharpen -- instructer, sharp(-en), whet.
razor
ta`ar (tah'-ar)
a knife or razor (as making bare): also a scabbard (as being bare, i.e. empty) -- (pen-)knife, razor, scabbard, shave, sheath.
working
`asah (aw-saw')
to do or make, in the broadest sense and widest application
deceitfully
rmiyah (rem-ee-yaw')
remissness, treachery -- deceit(-ful, -fully), false, guile, idle, slack, slothful.