Antonyms of adj recurrent

1 sense of recurrent

Sense 1
perennial, recurrent, repeated -- (recurring again and again; "perennial efforts to stipulate the requirements")

INDIRECT (VIA continual) -> sporadic -- (recurring in scattered and irregular or unpredictable instances; "a city subjected to sporadic bombing raids")

Similarity of adj recurrent

1 sense of recurrent

Sense 1
perennial, recurrent, repeated -- (recurring again and again; "perennial efforts to stipulate the requirements")
       => continual (vs. sporadic) -- (occurring without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series; "the continual banging of the shutters")