Difference between Expensive and Onerous

EXPENSIVE vs ONEROUS: ADJECTIVE

High in price or charging high prices
Marked by high prices.
Occasioning expense; calling for liberal outlay; costly; dear; liberal
Free in expending; very liberal; especially, in a bad sense: extravagant; lavish.
Having a high price or cost
Taking a lot of system time or resources
Requiring a large expenditure; costly.

Not easily borne; wearing
Troublesome or oppressive; burdensome. : burdensome.
Entailing more liabilities than benefits or imposing significant obligations.
A good and legal consideration; -- opposed to gratuitous.
Imposing or constituting a physical, mental, or figurative load which can be borne only with effort.

Costly; requiring or entailing much expense: as, an expensive dress or equipage; an expensive family; expensive tastes or habits.
Free in expending; liberal; extravagant; lavish.

I only had to greet the guests"
Wearing
Not easily borne
Synonyms 1. Heavy, weighty, toilsome.
In Scots law, imposing a burden in return for an advantage; being for a consideration: as, an onerous contract: opposed to gratuitous.
Burdensome; oppressive.

Affordable, Consuming, Cheap, Unaffordable, Cumbersome, Prohibitive, Inexpensive, Dearly won, Big ticket, High priced, Dear, Overpriced, Pricy, Costly, Pricey

Burden, Daunting, Complicated, Arduous, Unwieldy, Inconvenient, Expensive, Stringent, Costly, Draconian, Cumbersome, Restrictive, Heavy, Taxing, Burdensome

Affordable, Consuming, Cheap, Unaffordable, Cumbersome, Prohibitive, Inexpensive, High priced, Dearly won, Big ticket, Dear, Overpriced, Pricy, Costly, Pricey

Burden, Daunting, Complicated, Arduous, Unwieldy, Inconvenient, Expensive, Stringent, Costly, Draconian, Cumbersome, Restrictive, Heavy, Taxing, Burdensome

Wrong choices in this realm get very expensive.
Really not expensive and a security for yourself.
The more expensive the car, the more expensive the fee.
The typical payday loan is more than twice as expensive as a credit card late fee and much more expensive than paying bills late.
In Florida, leases are less expensive to register and more expensive to renew because of the taxing structure outlined in the state statutes.
Until now your options were limited to enterprise, expensive paired with lucky, or enterprise paired with more expensive.
The most expensive link is only seven times the cost of the least expensive.
We ranked our cities from least expensive to most expensive to give you a snapshot of nursing home costs by location.
Arbitration can be more expensive than negotiation or mediation, but it is often less expensive than litigation.
For this reason, flashy and expensive bikes that are high theft targets will be more expensive to insure.