Strong's #2803: chashab (pronounced khaw-shab')
 a primitive root; properly, 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:--(make) account (of), conceive, consider, count, cunning (man, work, workman), devise, esteem, find out, forecast, hold, imagine, impute, invent, be like, mean, purpose, reckon(-ing be made), regard, think.
Brown-Driver-Briggs Hebrew Lexicon:
 ׁ 
  châshab 
 
 1) to think, plan, esteem, calculate, invent, make a judgment, imagine, count
 
 1a) (Qal)
 
 1a1) to think, account
 1a2) to plan, devise, mean
 1a3) to charge, impute, reckon
 1a4) to esteem, value, regard
 1a5) to invent
 
 1b) (Niphal)
 
 1b1) to be accounted, be thought, be esteemed
 1b2) to be computed, be reckoned
 1b3) to be imputed
 
 1c) (Piel)
 
 1c1) to think upon, consider, be mindful of
 1c2) to think to do, devise, plan
 1c3) to count, reckon
 
 1d) (Hithpael) to be considered
 
  Part of Speech: verb
Relation: a primitive root
Usage:
This word is used 124 times:
Jeremiah 26:3: "me of the evil, which I  purpose to do unto them because"
Jeremiah 29:11: "the thoughts that I  think toward you, saith the LORD, thoughts"
Jeremiah 36:3: "the evil which I  purpose to do unto them; that they may return every man"
Jeremiah 48:2: "of Moab: in Heshbon  they have devised evil against it; come, and let us cut it off"
Jeremiah 49:20: "Edom; and his purposes, that  he hath purposed against the inhabitants of Teman: Surely"
Jeremiah 49:30: "hath taken counsel against  you, and hath conceived a purpose against"
Jeremiah 50:45: "Babylon; and his purposes, that  he hath purposed against the land of the Chaldeans: Surely"
Lamentations 2:8: "The LORD  hath purposed the wall of the daughter of Zion: he hath stretched out a line,"
Lamentations 4:2: "comparable to fine gold, how  are they esteemed as earthen pitchers, the work of the hands"
Ezekiel 11:2: "of man, these are the men  that devise mischief, and give wicked counsel"
Ezekiel 38:10: "come into thy mind,  and thou shalt think an evil thought:"
Daniel 11:24: "among them the prey, and spoil, and riches:  yea, and he shall forecast his devices against the strongholds, even for"
Daniel 11:25: "army; but he shall not stand: for  they shall forecast devices against"
Hosea 7:15: "have bound their arms,  yet do they imagine mischief against"
Hosea 8:12: "I have written to him the great things  but they were counted as a strange thing."
Amos 6:5: "to of the viol,  and invent to themselves instruments of music, like David;"
Jonah 1:4: "tempest in the sea, so that the ship  was like to be broken."
Micah 2:1: "Woe  to them that devise and work evil upon their beds! when the morning"
Micah 2:3: "against this family  do I devise an evil, from which"
Nahum 1:9: "What  do ye imagine the LORD? he will make an utter end: affliction"
Nahum 1:11: "There is one come out of  thee, that imagineth evil against the LORD, a wicked counselor."
Zechariah 7:10: "the stranger, nor the poor; and let none  of you imagine evil against his brother in your heart."
Zechariah 8:17: "And let none  of you imagine evil in your hearts against his neighbor; and love"
Malachi 3:16: "before him for them that feared the LORD,  and that thought upon his name."