UNLEADED
unleaded, leadless
(adjective) not treated with lead; “unleaded gasoline”
unleaded
(adjective) not having leads between the lines
Source: WordNet® 3.1
Etymology
Adjective
unleaded (not comparable)
Without lead.
(US standard of identity, of gasoline) Containing no more than 0.05 grams of lead per gallon.
(US, slang, of coffee) Decaffeinated.
(AU, slang, of beer) Having low alcohol content.
Synonyms
• (without lead): lead-free, leadless, nonleaded
• (decaffeinated): decaffeinated, caffeine-free, decaf
• (low in alcohol content): light
Verb
unleaded
past tense of unlead
Noun
unleaded (usually uncountable, plural unleadeds)
An unleaded fuel.
(US, slang) Decaffeinated coffee.
(Australia, slang) Low-alcohol beer.
Source: Wiktionary