He is invincible at football.
Bacteria is something invisible to the eye.
She was invisible in the dusk of the room.
I'm not involved.
Apply the wound with some iodine.
It was ironic that the murderer was his wife.
What you have just said is irrelevant to the subject.
It must be done, irrespective of cost.
The fields need irrigating.
It is impossible to make plants grow in a desert without irrigation.
Several villages have been isolated by the heavy snowfall.
Even an oversight in the design might issue in heavy losses.
The issue was not primarily a political one.
I bought the novel the day after its issue.
There was an interesting item in the newspaper today.