Words similar to informal

Example sentences for: informal

How can you use “informal” in a sentence? Here are some example sentences to help you improve your vocabulary:

It seems unnecessary, when we have available terms like informal, colloquial, formal, nonstandard, literary, poetic , and even conversational (though I have never seen the last used), to come up with still another set of labels, but Jules Hook, the author of a number of responsible and useful works dealing with English, feels that FF and SWE (for `family and friends' and `standard written English,' respectively) tell the user something that he might not already know or feel about usages of borderline words.
I already miss my informal discussions with members of the Class of '90.
The paper underscores that Gen. Wiranto made his comments in informal talks with a U.N. delegation he was escorting around East Timor.
In late 1991 or 1992, discussions in Sudan between al Qaeda and Iranian operatives led to an informal agreement to cooperate in providing support-even if only training-for actions carried out primarily against Israel and the United States.
On the other hand, egg in the good/bad egg context is in, and I should not expect many dictionaries to label that sense (in contrast to the aerial bomb sense, which is slang) anything but Informal or, depending on their style, Colloquial .