• time
  18.59%
  Those were hard times.
• work
  13.62%
  Mowing the lawn is hard work.
• drive
  7.61%
  Bigger hard drive?
• hit
  3.96%
  Hard hits are a part of the game.
• way
  3.84%
  Yes the hard way yes.
• part
  2.10%
  Now the hard part.
• evidence
  1.97%
  Hard evidence is sketchy.
• look
  1.28%
  I gave him a hard look.
• hat
  1.17%
  No hard hats off.
• worker
  0.98%
  Hard worker.

• new
  8.46%
  New evidence supports his thesis.
• scientific
  3.64%
  Better scientific evidence.
• further
  3.57%
  Further evidence is welcome.
• insufficient
  3.55%
  Insufficient evidence, said the authorities.
• physical
  3.36%
  Can you provide physical evidence?
• anecdotal
  2.91%
  Anecdotal evidence abounds.
• sufficient
  2.71%
  Not sufficient evidence or something.
• hard
  2.41%
  Hard evidence is sketchy.
• clear
  1.95%
  The studies yielded clear evidence.
• strong
  1.82%
  It is very, very strong evidence indeed.