| constant(adjective, prompt, exact, regular, normal) |
| epochal(adjective, regular, irregular, erratic, infrequent) |
| isochronal(adjective, regular, irregular, repetition, erratic) |
| isochronous(adjective, regular, irregular, repetition, erratic) |
| steady(adjective, regular) |
| irregular |
| daily(adjective, day) |
| every once in a while(expression, adjective, idiom, time, regular) |
| monotonous(adjective, regular, normal, recurrent) |
| oscillating(adjective, recurrent) |
| perennial |
| perpetual(regular, normal, recurrent, repeated) |
| serial(adjective, regularity of recurrence periodicity) |
| episodic |
| habitual(adjective, regular, normal, recurrent) |
| iterative(adjective, irregular, infrequent, recurrent, sporadic) |
| normal(adjective, regular, recurrent) |
| on-again-off-again(adjective, uncertain, regular, irregular, broken) |
| punctual(adjective, characteristic, time, quality, speed) |
| random(adjective, irregular, restless, disturbed, broken) |