Difference between Unpredictable and Occasional

UNPREDICTABLE vs OCCASIONAL: NOUN

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

Occurring or appearing at usually irregular intervals
Employed in a specified capacity from time to time
Occurring, encountered, done, or taken from time to time; irregular or infrequent. : periodic.
Created for a special occasion.
Being a factor that makes something possible; being a cause of something.
Recurring or reappearing from time to time
Occurring from time to time
Acting in the indicated role 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 or appearing irregularly from time to time.
Not very often.
Created for a specific occasion.
Intended for use as the occasion requires.

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

Uncertain, Predictable, Unstable, Volatile, Erratic, Undeterminable, Occasional, Aleatory, Sporadic, Episodic, Freakish, Irregular, Indeterminable, Unforeseeable, Capricious

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

Uncertain, Predictable, Unstable, Volatile, Erratic, Undeterminable, Occasional, Aleatory, Sporadic, Episodic, Freakish, Irregular, Indeterminable, Unforeseeable, Capricious

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

Sloppy code results in unpredictable and unreliable performance.
The Philippine national marine policy: navigating unpredictable currents.
Network latency and failures can make things unpredictable.
The outcome in any such proceedings are unpredictable.
Strong, unpredictable emotions area natural part of recovery.
Unpredictable language performance: The form and the content of the language produced would be to some extent unpredictable.
It also requires reliable access to enough cash resources at unpredictable times and to unpredictable extents to meet uncertain cashflow obligations.
With blowing winds, blinding sunlight, scorching temperatures, unpredictable weather conditions and even more unpredictable fellow boaters, why impair yourself further?
For workers paid by the hour, unpredictable hours mean unpredictable incomes.
And unpredictable hours inevitably lead to an unpredictable income.