Free (a): costing nothing. Ex: Admission is free Source
Free (adv): without payment. Ex: Children under five travel free. Source
Chargeable (a): of a sum of money) that must be paid by somebody. Ex: Any expenses you may incur will be chargeable to the company. Source
However, "Chargeably" means "At great cost; expensively." Source
So, Is "Chargeable" an antonym of "Free" in term of adjective?
So, can we say "Admission is chargeable"
However, "Chargeably" is not an antonym of "Free" in term of adverb right?