Celtic cruised to their 22nd straight Scottish Premiership victory to move 27 points clear at the top and within seven points of a sixth straight title.
Celtic dominated possession but had to wait until the 43rd minute before Scott Sinclair curled home a superb opener.
Their second came 12 seconds into the second half, Moussa Dembele tapping in after a howler from Owain Fon Williams.
Stuart Armstrong's whipped free-kick then beat the Welshman at his near post before Dembele chipped in his second.
It was the Frenchman's 31st goal of a stellar debut season, and his 11th in his last five games.
With a 27-point lead over Aberdeen with 11 games left and a huge advantage in goal difference, two more wins would effectively be enough for Celtic to retain their title.
Defeat left Caley Thistle two points adrift at the bottom.
More to follow.