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irregular

irregular

42 3.5
Happening at no fixed times
  • adjective
  • /ɪˈrɛɡjələr/
: irregular
  • His pulse is very irregular.
  • irregular intervals
  • on an irregular basis
  • an irregular pattern

Soon after their heart beats became weak and irregular, they went into severe shock.

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Examples

  • Your breathing is irregular.

  • You may expect frequent and irregular visits from me.

  • This is a highly irregular procedure.

  • We try to model folks working irregular shift schedules.

  • As I said the heating can be a bit irregular.

  • My cycles are very irregular.

  • Of the many comic books, two remained in 1991, both on an irregular publication schedule.

    Academic text (1995)
  • It's an irregular heartbeat that can lead to strokes.

  • Now, that's an irregular heart rhythm that's linked to stroke and other health problems.

  • Her sleep schedule is quite irregular, varying greatly from night to night.

Synonyms

occasional
vsirregular
257 2.8

Happening now and then but not often

is the wider term for lacking a fixed pattern or rhythm
unpredictable
vsirregular
166 4.4

Likely to change suddenly and hard to know in advance

focuses instead on timing that changes suddenly rather than lack of steady pattern
erratic
vsirregular
82 6.1

Not regular or predictable and likely to change suddenly

is the neutral description of lacking a steady pattern or rhythm
intermittent
vsirregular
36 6.5

Happening sometimes but not all the time

is the general notion of lacking a fixed pattern in timing
sporadic
vsirregular
34 7.0

Happening sometimes and in different places

expresses the same scattered timing but can be more general
episodic
vsirregular
3 7.1

Happening only sometimes and not regularly

is the broader idea of lacking regular occurrence or rhythm
arrhythmic
vsirregular
3 8.2

Not having a regular beat or pattern

is the broad term for missing regular timing rather than just beats
aperiodic
vsirregular
  • Specialized
1 8.2

Does not happen at regular times or repeat a pattern

is the general label for lacking fixed timing or pattern
noncyclical
vsirregular
1 7.2

Not happening in regular cycles

is the overall idea of having no fixed pattern over time
nonperiodic
vsirregular
1 7.6

Happening at irregular times

is the broader expression for lacking a fixed pattern or rhythm
unrhythmical
vsirregular
1 7.4

Having no steady beat or regular pattern

is the broader sense of having no fixed rhythm or pattern
nonmetrical
vsirregular
1 7.8

Not having a regular beat or rhythm in poetry and music

is the wider concept of no fixed pattern beyond poetic meter
unrhythmic
vsirregular
1 7.9

Having no regular beat so movement or sound feels uneven

applies more widely to lacking any fixed pattern or timing
nonrhythmic
vsirregular
1 7.4

A sound that has no regular beat

covers lack of pattern more generally, not only deliberate rhythmlessness
arrhythmical
vsirregular
9.3

A sound or movement that has no regular beat

describes the same absence of pattern in a more general way
unmetrical
vsirregular
  • Literature
8.2

Not having a regular rhythm in speech, music, and poetry

is the general absence of fixed timing, not limited to meter
nonsystematic
vsirregular
6.7

Not arranged according to a plan or regular order

refers more narrowly to lack of organized pattern rather than timing

Antonyms

∞ 1.0

Happening at fixed times on a schedule

181 2.5

Easy to guess what will happen

Compounds

Happening at times that are not regular or predictable

How Regular

constant
525 2.5
regular
∞ 1.0
irregular
42 3.5
intermittent
36 6.5
sporadic
34 7.0
random
644 3.4

Surface Forms

irregular positive
irregularer comparative
irregularest superlative

Morphology

irregular = regular (transparent) = ir + regular

Negative prefix 'ir-' + 'regular' gives the meaning 'not regular' (not at regular intervals), which is directly inferable.

Etymology

Irregular comes from the parts in- meaning 'not' and regular meaning 'at fixed times' or 'following a pattern'. So an irregular heartbeat or schedule does not happen at regular times or with a steady rhythm.