I stumbled upon the English term Truthiness
"truth" that a person claims to know intuitively "from the gut" in that it "feels right" without regard to evidence, logic, intellectual examination, or facts
I like this word very much, especially in the context of conspiracy theories.
In German you would use diminutive suffixes to minimize/belittle a word, a subjective opinion with a little bit feeled truth in it.
What spanish suffixes would you use for verdad to build the counterpart. I only know there are different suffixes for different word-endings. Please explain also if/how phonetic (maybe dialects - works well in German) reasons would influence your choice, so it doesn't sound too artificial.