What is the opposite of periodical?

Need antonyms for periodical? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of occurring or appearing at intervals
Adjective
Opposite of not of a regular occurrence
“I seem to be getting frequent aches and pains in my body as I get older.”
Adjective
Opposite of regular, even, and continuous in development, frequency, or intensity
Adjective
Opposite of occurring continuously over a period of time
“I suspect that something is amiss because the car makes an intermittent but very loud noise when the engine is off.”
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