We can bring these issues up during an informal conversation with our staff
Our gathering will be informal.
The organizer was late to our informal orientation.
The use of "gonna" instead of "going to" is a common colloquialism in American English.
You don't need a fancy dress for an informal occasional.
You just did! Zilch is a slang word for zero, used only with very informal tone.
The dinner party was an informal affair held by a neighbor.Informal changes can be made to the Constitution by laws and interpretations of laws.
I drove thru the tunnel to get to the other side of the mountain.
"Specs" is an informal word for spectacles, although many people don't use the word at all, and use "glasses" instead.
(note: who'll is considered an informal use, a contraction of who will)With such a group of athletes, no one can predict who'll come in first.Who'll go to the store for me?
She has a retentive memory, able to remember even the smallest details of past events.
use it by saying- how can you use the word ebullient in a sentence?
yes but it depends if you want your writing to be formal or informal.