Difference between Unlikely and Unusual

UNLIKELY vs UNUSUAL: NOUN

Not commonly encountered
Not usual or common or ordinary
Being definitely out of the ordinary and unexpected; slightly odd or even a bit weird
Not usual, common, or ordinary.
Not usual; uncommon; rare
Unlike what is expected; differing in some way from the norm.
More than usual.

Such as cannot be reasonably expected; improbable: as, an unlikely event.
Not holding out a prospect of success or of a desired result; likely to fail; unpromising.
Not calculated to inspire liking or affection; not likable or lovable.
In an unlikely manner; with no or little likelihood; improbably.

Slightly odd or even a bit weird
Synonyms Uncommon, unwonted, singular, remarkable, odd.
Not usual; not frequent; not common; rare; strange; as, an unusual season; a person of unusual erudition.

Impossible, Reluctant, Plausible, Inconceivable, Doubtful, Likely, Outside, Remote, Last, Unbelievable, Supposed, Unconvincing, Farfetched, Implausible, Improbable

Eery, Singular, Eerie, Different, Freaky, Curious, Exotic, Unique, Unaccustomed, Weird, Extraordinary, Odd, Peculiar, Strange, Uncommon

Impossible, Reluctant, Plausible, Inconceivable, Doubtful, Likely, Outside, Remote, Last, Unbelievable, Supposed, Unconvincing, Farfetched, Implausible, Improbable

Eery, Singular, Eerie, Different, Freaky, Curious, Exotic, Unique, Unaccustomed, Weird, Extraordinary, Odd, Peculiar, Strange, Uncommon

Obviously, in my case it is EXTREMELY unlikely.
John Mark might not be unlikely at all.
Spain but I think this one is unlikely.
Discountable effects are those extremely unlikely to occur.
NBA comeback may seem unlikely at this point.
Russia investigation even though his election seemed unlikely.
It indicates the null hypothesis is very unlikely.
Just as people who borrow murder mysteries are unlikely to be murderers, so those seeking information about terrorism are unlikely to be terrorists.
When looking for solutions to problems they are unlikely to arbitrarily rule out any possibilities, even if they may seem unlikely to others.
Responses can be: very likely, somewhat likely, neither likely or unlikely, somewhat unlikely and very unlikely.

Try combining common first names with unusual last names, or unusual first names with common last names.
It appears that a pig in prison was not unusual, nor was it unusual for that pig to endure quite a lengthy stay.
They meet in the most unusual of circumstances and their relationships grows in the most unusual of ways.
The Eighth Amendment prohibits cruel and unusual punishments, and torture would surely meet the standard of cruel and unusual.
Suspicious orders include, but are not limited to, orders of unusual size, orders deviating substantially from a normal pattern, and orders of unusual frequency.
The unusual ruling follows a bench trial a few weeks ago for an unusual case brought by a prospective buyer in small claims court.
Extraordinary or exceptional events: such as unpredictable or unusual events requiring urgent, impromptu and unusual workforce.
Reversal of more than a few positives per year for most companies is unusual, though some industries and locations have unusual circumstances.
Routinely monitors financial exception reports for unusual activities, transactions, and investigates anomalies or unusual transactions.
Other unusual acts or unusual behavior that may suggest drug or alcohol use.