vitci -vit- gismu

x1 is irregular/occasional/intermittent in property/action/aspect x2.

See also ranji, rufsu, suksa.


In notes:

ranji
x1 (event/state) continues/persists over interval x2; x1 (property - ka) is continuous over x2.
rufsu
x1 is rough/coarse/uneven/[grainy/scabrous/rugged] in texture/regularity.
suksa
x1 (event/state) is sudden/sharply changes at stage/point x2 in process/property/function x3.