expertisio 

To have or hold knowledge beyond all others.

Steve is an expertisio at tear'n up da road.

expertisio by Rio January 15, 2004

experticity 

A word used by non-experts to make themselves sound like an expert. Has more syllables than the word expertise, thus the speaker attempts to sound more intelligent, but usually fails.

Eddie: "Are you finished yet dude? I have important things to do like watch mold grow."
Brandon: "I am trying to share my experticity with you, now that you are a single guy"
Eddie: "I don't get paid enough to have to hear this, go down the hall and share it with Ray."

experticity by dave_the_thinker December 28, 2017

Expertising 

When one is working to become more knowledgeable in an area or increase their ability in a skill.

Person 1: Your have really been expertising your guitar skills with all of that practice.

Person 2: Thanks man, the hard work is really paying off.

Expertising by Stoolie May 22, 2014

isolation expertise 

n. the ability of being alone at all times with no exception. usually owned by internet people

A: Did you know Jimmy just joined the internet last night?
B: Wow, I wonder how long until he learns isolation expertise
A: What?

isolation expertise by whalecome March 1, 2021

Expertiseness

Someone who has an expert opinion or is an expert on the matter. Their expertiseness is their expert opinion.

I wish to ask for your expertiseness.

Expertiseness by kaigal February 8, 2010

Expertishious

Expertishious(ly): An adjective used to describe something that is accurate; based in truth or fact.

“The museum was filled with expertishious information.”
“I already know I expertishiously failed my exam earlier today, I don’t even need to check the grade.”

Expertishious by FreakenEaken August 8, 2022

expertivity 

Synonym of expertise.

Drummond asked Brady questions regarding his expertivity on Holy Scripture.

expertivity by JDatx512 August 19, 2008