Which imagine
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
ra` (rah)
bad or (as noun) evil (natural or moral)one), worse(-st), wretchedness, wrong. (Incl. feminine raaah; as adjective or noun.).
in their heart
leb (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect
continually
yowm (yome)
a day (as the warm hours),
are they gathered together
guwr (goor)
to turn aside from the road (for a lodging or any other purpose), i.e. sojourn (as a guest); also to shrink, fear (as in a strange place); also to gather for hostility (as afraid)
for war
milchamah (mil-khaw-maw')
a battle (i.e. the engagement); generally, war (i.e. warfare) -- battle, fight(-ing), war(-rior).