(a.) Occurring 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.

aimless amorphous broadcast broken capricious careening casual catching catchy chance changeable changing choppy communicable contagious desultory deviating deviative deviatory different diffuse disarticulated disconnected discontinuous discrete disjunct disordered disorderly dispersed dispread disproportionate disseminated dissipated distributed divaricate divergent diversified diversiform eccentric endemic epidemial epidemic epiphytotic epizootic erose erratic few fitful flickering fluctuating formless frivolous gratuitous guttering halting haphazard herky-jerky heteroclite hit-or-miss immethodical impulsive inchoate incoherent inconsistent inconstant indiscriminate infectious infective inoculable intermittent intermitting irregular jagged jerky lurching meaningless mercurial misshapen motley mutable nonconformist nonstandard nonsymmetrical nonsystematic nonuniform occasional on-again-off-again orderless pandemic patchy periodical pestiferous pestilential planless pluralistic promiscuous ragged rambling random rare rough scarce scattered scrappy seldom senseless separate shapeless single snatchy sparse spasmatic spasmic spasmodic spasmodical spastic spotty spread spreading staggering straggling straggly strewn strown systemless taking unarranged uncertain unclassified uncommon undirected unequable unequal uneven unexpected unfrequent ungraded unjoined unmethodical unmetrical unordered unorganized unorthodox unregular unrhythmical unsettled unsorted unstable unsteady unsymmetrical unsystematic ununiform vague variable variegated variform various varying veering wandering wavering widespread wobbling wobbly zymotic