Synonyms for Think hard:

• v.

  •concentrate (verb)
  • settle,
  • apply,
  • intensify,
  • center,
  • meditate,
  • muse,
  • head trip,
  • attend,
  • examine,
  • contemplate,
  • peruse,
  • focus,
  • ponder,
  • weigh,
  • study,
  • scrutinize,
  • establish,
  • put,
  • knuckle down,
  • bring to bear,
  • set,
  • need,
  • ruminate,
  • sweat.
  •puzzle (verb)
  • cudgel,
  • marvel,
  • brood.

• Other synonyms:

  •Other relevant words:
  • concentrate,
  • fixate,
  • mull over,
  • puzzle,
  • puzzling,
  • rivet,
  • think about,
  • Marveled,
  • Meditated,
  • Riveted,
  • Cudgeled,
  • Cudgeling,
  • Cudgelled,
  • Cudgelling,
  • rivets,
  • thought about,
  • thinking about,
  • thinks about,
  • pour it on,
  • hammer away at,
  • focus attention,
  • brood over,
  • ask oneself,
  • be engrossed in,
  • consider closely,
  • crack one's brains,
  • direct attention,
  • fix attention,
  • get on the beam,
  • give attention,
  • giving attention,
  • mulling over,
  • mulls over,
  • occupy thoughts,
  • pour on,
  • put mind to,
  • rack one's brains,
  • think hard,
  • rack brains.