Difference between Infrequent and Occasional

INFREQUENT vs OCCASIONAL: NOUN

A production caused by or adapted to some special occurrence, or the circumstances of the moment; an extemporaneous composition.

Recurring or reappearing from time to time
Occurring from time to time
Acting in the indicated role from time to time.
Occurring or appearing at usually irregular intervals
Employed in a specified capacity from time to time
Created for a special occasion.
Intended for use as the occasion requires.
Being a factor that makes something possible; being a cause of something.
Created for a specific occasion.
Not very often.
Occurring or appearing irregularly from time to time.
Occuring at times, but not constant, regular, or systematic; made or happening as opportunity requires or admits; casual; incidental.
Produced by accident.
Of or pertaining to an occasion or to occasions; intended for a specific occasion; for use only when needed, and not regularly.
Some circumstance preceding an effect which, without being the real cause, becomes the occasion of the action of the efficient cause.
Occurring, encountered, done, or taken from time to time; irregular or infrequent. : periodic.

Not frequent or customary; rare; uncommon; unaccustomed.
In zoology, being, as component parts, far removed from one another; distant; not numerous or close: as, infrequent spines, punctures, etc.
In botany, distant; sparsely placed: said of punctures, glands, hairs, etc.
Not frequent

Of occasion; incidental; hence, occurring from time to time, but without regularity or system; made, happening, or recurring as opportunity requires or admits: as, an occasional smile; an occasional fit of coughing.
Called forth, produced, or used on some special occasion or event; suited for a particular occasion: as, an occasional discourse.
That serves as or constitutes the occasion or indirect cause; causal.
Occurring on a temporary or irregular basis

Low, Scant, Prevalent, Casual, Common, Few, Episodic, Scarce, Unusual, Sparse, Uncommon, Rarely, Frequent, Rare, Occasional

Accidental, Random, Improvised, Respite, Unscheduled, Incidental, Odd, Sometimes, Sporadic, Intermittent, Irregular, Unpredictable, Casual, Episodic, Infrequent

Low, Scant, Prevalent, Casual, Common, Few, Episodic, Scarce, Unusual, Sparse, Uncommon, Rarely, Frequent, Rare, Occasional

Accidental, Random, Improvised, Respite, Unscheduled, Incidental, Odd, Sometimes, Sporadic, Intermittent, Irregular, Unpredictable, Casual, Episodic, Infrequent

Regret following transition is not an infrequent phenomenon.
Regular customers require different marketing than infrequent ones.
Infrequent or random exercise will do little good.
Achilles tendon rupture or injury is not infrequent.
However, gestures were relatively infrequent in this setting.
There are two basic properties: the subset of frequent itemset is also frequent itemset, the superset of infrequent items is also an infrequent itemset.
Infrequent or weak ovulation will often reveal itself as oligomenorrhea, or infrequent periods.
Conversely, if an itemset is infrequent, then all of its supersets must be infrequent too.
Similarly, for any infrequent itemset, all its supersets must be infrequent too.
Infrequent writes and infrequent reads to the LBA range indicated.