غير رسمي v angličtině:

Women's Liberation is a broad-based but informal popular movement.

Today's party is informal.

The school uniform is convenient because it can be worn for both informal and formal occasions.

My American classes are more informal.

informal conversation

Informal diction is always full of mystery and surrealism.

This implies a fun and relaxed working atmosphere where team achievement is highly valued, communication is extremely important and traditional 3-hour meetings have been replaced by informal chats in the queue for coffee.

Don't be afraid to show yourself through speech and take every opportunity to speak to others in English and soon you will feel right at home in informal conversational situations.

Japanese speakers of English often have difficulty in dealing with informal conversation, such as at parties or in small informal groups.

In those days, or at any rate in Cambridge, laboratory life was rather informal.

small talk is what we call a polite and informal conversation about things which aren't really important or meaningful when meeting people socially

"One example of this is the 'informal' labour market for women. "

Our motorbike club is informal.

"Hi" is an informal way of saying hello.

Once you have reached informal agreement, you should enter into a contract with the other party.

The fact is apparent to the most casual observer.

A casual remark can hurt someone.

casual clothes

I get the impression we will pay for this casual approach sooner or later.

Even casual observers realize one striking thing about drones — they often have four propellers (but can have anywhere from three to eight) unlike traditional RC helicopters, which have only one main rotor.

The verb 'help' takes to-infinitives and bare infinitives but bare infinitives are said to be the most common in casual text; as also used in this example sentence.

Up to now we've been taking a casual relaxed attitude toward our relationship but I want to start looking at us more critically.

That topic is too intimate to share with casual acquaintances.

I want our relationship to be casual - let's not talk about getting married just yet!

The interview took place around the kitchen table and was very casual.

　His voice was casual, but Harry couldn't help noticing that Mr. Weasley's ears had gone red, just like Ron's did when he was under Pressure.

Mono-casual, that is, caused by one thing.

It won't be an elegant party, so you can put on something casual.

Why can female staff in Canterbury wear casual clothes but the men have to wear shirts and ties?

You really need to take your studies more seriously if you want to succeed – your attitude is far too casual