-
truth
[UNCOUNTABLE]
The truth of her words was doubtful.
The truth of her feelings is certain.
-
reality
[UNCOUNTABLE]
The reality of her words is doubtful.
He questioned the reality of my feelings.
-
truthfulness
-
rightness
-
veracity
formal
[UNCOUNTABLE]
-
genuineness
-
trueness
-
realness