1660s, "characterized by concern or sympathy," past-participle adjective from interest (v.). From 1828 as "having an interest or stake (in something);" sense "motivated by self-interest" (1705) is perhaps a back-formation from disinterested. Related: Interestedness.
interested in sports
an interested audience
interested in knowing who was on the telephone
interested spectators
was interested to hear about her family
the interested parties met to discuss the business
interdependent
interdict
interdiction
interdisciplinary
interest
interested
interesting
interface
interfacial
interfaith
interfere
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