Words similar to serious

Example sentences for: serious

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

These illness syndromes can be of interest because they might provide several days' advance warning of a serious problem, such as anthrax, and also because they make use of the large body of information in encounters for which no diagnostic testing is performed.
Could there be serious security leaks at some of the primo op-ed desks?
To describe these debates is to make them sound more rigorous and intellectually serious than they really are.
But in reviewing the works of others, attention must be paid to such materials, and the Bibliography of Selected Sources and Dictionaries Consulted include only twenty-five titles under the former category (plus fifteen of Patrick O'Brian's Jack Aubrey novels) and only ten under the latter, some of which are curious choices indeed: Robert Hunter's Universal Dictionary of the English Language, New York: Collier, 1897, which I have never heard of; Eric Partridge's Origins: A Short Etymological Dictionary of Modern English contains a great many errors and ought to be avoided by serious researchers; the author evidently chose not to wade through Johnson's Dictionary, relying instead on McAdam and Milne's A Modern Selection.
Charles Street serves as the community’s main street and as a magnet for serious antique collectors.