SPORADIC
sporadic
(adjective) recurring in scattered and irregular or unpredictable instances; “a city subjected to sporadic bombing raids”
Source: WordNet® 3.1
Etymology
Adjective
sporadic (comparative more sporadic, superlative most sporadic)
(archaic) (of diseases) occurring in isolated instances; not epidemic.
Rare and scattered in occurrence.
Exhibiting random behavior; patternless.
Anagrams
• caproids, carpoids, picadors
Source: Wiktionary
Spo*rad"ic, a. Etym: [Gr. sporadique. See Spore.]
Definition: Occuring singly, or apart from other things of the same kind,
or in scattered instances; separate; single; as, a sporadic fireball;
a sporadic case of disease; a sporadic example of a flower. Sporadic
disease (Med.), a disease which occurs in single and scattered cases.
See the Note under Endemic, a.
Source: Webster’s Unabridged Dictionary 1913 Edition