Conditional
Part of speech: noun
Definition: More completely conditional sentence, a statement that depends on a condition being true or false. The conditional mood. A statement that one sentence is true if another is.
Part of speech: adjective
Definition: Depending on a condition. Stating that one sentence is true if another is.
Example sentence: I think I have made allowances for the kind of despair which would test my faith, but you cannot know in advance what disaster to those you love would be too much to bear faithfully, and like everyone's, my faith is weakly conditional in some ways. I hope, I pray not to lose it. My fingers are crossed. Also my heart.
Counterfactual
Part of speech: adjective
Definition: Contrary to the facts; untrue.
Part of speech: noun
Definition: A claim, hypothesis, or other belief that is contrary to the facts.A conditional statement in which the conditional clause is false, as "If I had arrived on time . . .".