Synonyms for Racks brains:

• v.

  •brainstorm (verb)
  • conjure up,
  • ponder,
  • dream up,
  • invent,
  • think,
  • share ideas,
  • put heads together,
  • rack brains,
  • create,
  • deliberate,
  • plan,
  • conceive,
  • analyze,
  • conceptualize.
  •concentrate (verb)
  • hammer,
  • contemplate,
  • direct attention,
  • give attention,
  • pour it on,
  • muse,
  • set,
  • put,
  • knuckle down,
  • need,
  • attend,
  • apply,
  • settle,
  • head trip,
  • fixate,
  • focus attention,
  • rivet,
  • put mind to,
  • study,
  • get on the beam,
  • intensify,
  • establish,
  • brood over,
  • be engrossed in,
  • occupy thoughts,
  • examine,
  • fix attention,
  • think hard,
  • hammer away at,
  • center,
  • focus,
  • ruminate,
  • sweat,
  • peruse,
  • crack one's brains,
  • bring to bear,
  • meditate,
  • weigh,
  • scrutinize,
  • consider closely,
  • rack one's brains.
  •deliberate (verb)
  • consult,
  • speculate,
  • turn over,
  • judge,
  • excogitate,
  • argue,
  • chew over,
  • reason,
  • kick around,
  • bat it around,
  • sweat over,
  • run up a flagpole,
  • reflect,
  • talk over,
  • stew over,
  • revolve,
  • put on thinking cap,
  • mull over,
  • cogitate,
  • cerebrate,
  • consider,
  • knock around,
  • debate,
  • roll.
  •puzzle (verb)
  • cudgel,
  • brood,
  • ask oneself,
  • marvel,
  • think about.
  •ratiocinate (verb)
  • put on one's thinking cap.
  •ruminate (verb)
  • use one's head,
  • brainstorm,
  • stew about.
  •think (verb)
  • figure out,
  • have in mind,
  • comprehend,
  • imagine,
  • stew,
  • ideate,
  • logicalize,
  • resolve,
  • infer,
  • rationalize,
  • evaluate,
  • Intellectualize,
  • take under consideration,
  • stop to consider,
  • mull,
  • appreciate,
  • estimate,
  • deduce,
  • appraise,
  • sort out.

Antonyms for Racks brains:

• v.

  • brainstorm
    forget, destroy, neglect, ignore.
  • concentrate
    disperse, confuse, unsettle, disregard, scatter.
  • deliberate
    agree, abstain, go along, discard.
  • mull
    dismiss, advance, rush, hurry, leave.
  • puzzle
    elucidate, illustrate, unravel, not care, explain, clarify.
  • think
    misunderstand, disbelieve, excogitate.