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Aesthetic |esˈθetik| (also esthetic)
adjective
concerned with beauty or the appreciation of beauty : the pictures give great aesthetic pleasure.
• giving or designed to give pleasure through beauty; of pleasing appearance.

noun [in sing. ]
a set of principles underlying and guiding the work of a particular artist or artistic movement : the Cubist aesthetic.
DERIVATIVES

aesthetically |-ik(ə)lē| |ɛsˈθɛdək(ə)li| |əsˈθɛdək(ə)li| adverb : [as submodifier ] an aesthetically pleasing color combination.

ORIGIN late 18th cent. (in the sense [relating to perception by the senses] ): from Greek aisthētikos, from aisthēta ‘perceptible things,’ from aisthesthai ‘perceive.’ The sense [concerned with beauty] was coined in German in the mid 18th cent. and adopted into English in the early 19th cent., but its use was controversial until late in the century.

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"Beauty is in the eye of the beholder"
: Beauty cannot be judged objectively, for what one person finds beautiful or admirable may not appeal to another.