Lamar Odom -- No Signs of Improvement ... Prognosis Worsens

Lamar Odom's condition has deteriorated, and doctors are now telling the family the longer he remains in the condition he's in the less likely it is that he will recover.

Sources tell TMZ, Lamar did indeed squeeze Khloe's hand Wednesday night, which gave everyone hope, but Thursday morning doctors are saying it well could have been an involuntary movement.

As of Thursday morning, our sources say Lamar has shown no signs of consciousness or improvement. We're told 4 organs, including his kidneys, continue to fail. Our sources say doctors have been clear ... the fact that Lamar is not getting better significantly reduces his chances of survival.

As we reported, on Wednesday doctors gave Lamar a 50/50 chance of pulling through.