adj. 25B6; adjective OCCASIONAL, infrequent, irregular, periodic, scattered, patchy, isolated, odd; intermittent, spasmodic, fitful, desultory, erratic, unpredictable.
frequent, steady, continuous.
SPORADIC
Meaning of SPORADIC in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012