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unselfish

/ˌʌnˈsɛlfɪʃ/

Not excessively concerned with one’s own interests

From English, with the supplied source tracing it to Latin un- (not) + O.English self (one’s own person or identity).

adjective
un-
Latin
ūnus
One; the supplied etymology identifies this as the ancestor of un-.
English prefix
un-
A negative prefix meaning “not.”
self
Old English
self
One’s own person or identity.
Middle English
self
Personal identity or one’s own interests.
Modern English
self
The individual person, especially in contrast with others.
-ish
Old English
-isc
A suffix meaning “of the nature of” or “characteristic of.”
Middle English
-ish
Suffix forming adjectives with meanings such as “having the quality of.”
Modern English
-ish
Adjectival suffix in selfish, indicating a characteristic or tendency.
Combined
un- + self + -ish → unselfish
The negative prefix reverses selfish, producing the sense “not selfish.”
English
unselfish
First recorded in the 1690s as “not unduly attached to one’s interests.”
Modern English
unselfish
Not chiefly concerned with personal advantage or pleasure.
Modern English
unselfish

Picture a seventeenth-century English writer trying to describe someone who keeps one eye permanently fixed on his own advantage. The adjective selfish appeared in the 1630s, apparently among Presbyterian writers, built from the very plain word self and the adjective-forming suffix -ish. Then, in the 1690s, English simply placed un- in front of it—language’s compact way of saying “no”—and produced unselfish. The result sits beside generous, whose older meaning involved noble birth before it developed the moral sense of giving freely; both words show English turning social status and personal identity into ethical vocabulary. Remember the image: selfishness faces inward like a mirror, while unselfishness turns the mirror around so someone else can see themselves.

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