There's a word for the following expression:
To confuse people by using Scientific/ Technical/ obscure words (may be in an attempt to prove something or convince them of something.)
This word was on my vocabulary a long time ago. I haven't been able to remember it for a while now. I am pretty sure it's a single word.
For some reason if you think this might be a phrasal verb please feel free to include them in your suggestions.
P.S. Words like bombastic, pompous, grandiloquent etc are not the one's I'm looking for and clearly these doesn't properly match the meaning. Other than these, if you can stretch the definition a tad bit and point a word, it's fine.
Best Answer
Words with usage similar to what you've described:
I'd say obfuscate is closest. It's the one that particularly implies that you're trying to fool someone with complicated words or details.
This previous question has additional answers:
What is deliberately using complex sentences to confuse people called?
Aside from obfuscate, these other two answers seem most likely to be the word you've been thinking of:
Convolute (this is most commonly used as the adjective convoluted alongside a simpler verb like 'used'; e.g. "They used convoluted speech to hide the truth of the situation.")
Circumlocute (this is most commonly used in its noun form, as circumlocution; e.g. "His writing was full of circumlocution.")