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 on a periodical basis
Adjective
Occurring continuously over a period of time
“The constant barrage of criticism would eventually wear him down.”
Adjective
Opposite of not regular or permanent
“Following a review of her performance, she would be offered a permanent position at the company.”
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