marginal
mar-gin-al
adjective
Relating to the cost or revenue of producing one more unit.
"They analysed the marginal cost."
adjective
Very small in amount or effect; not considered important.
"There was only a marginal improvement."
adjective
Located at the edge or border of something; not central.
"She made marginal notes in the book."
Thesaurus
Synonyms: minimal, borderline, minimum, fringy, peripheral, unprofitable, narrow, bare