John Hughes felt Inverness just had "one of those days" when the ball would not go in for them against Hearts.
Caley Thistle hit the woodwork several times and Hearts 'keeper Jamie MacDonald played brilliantly in a 0-0 draw at the Caledonian Stadium.
"It's just one of they days," Hughes told BBC Scotland. "Their goalkeeper had a worldy; one or two great saves and it just wouldn't go in for us.
"No complaints about the effort, commitment and style of play."
Caley Thistle were by far the superior side in the first half, with Marley Watkins and Billy McKay seeing efforts hit the crossbar.
"In terms of ball retention we were well on top," said Hughes.
"Totally controlled the football match; hit the woodwork five times, two cleared off the line, creating plenty chances, two cleared off the line, good entertainment for the supporters, passed it very well."
Inverness have won two of their last 10 Scottish Premiership games but have a League Cup final against Aberdeen to look forward to in March.
"It's a little bit frustrating but not too disappointing, it's only frustration," added Hughes. "Right at this moment the team's possibly picking itself.
"I just look at Inverness and go 'just keep doing what we're doing' and we'll win more games than we'll lose."
Inverness have a home Scottish Cup fifth-round replay against Stranraer on Tuesday after the initial match finished 2-2.