abstract -
existing only in the mind; separated from embodiment; "abstract words like `truth' and `justice'"
concrete capable of being perceived by the senses; not abstract or imaginary; "concrete objects such as trees"
impalpable,
intangible imperceptible to the senses or the mind; "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
nonrepresentational of or relating to a style of art in which objects do not resemble those known in physical nature
abstractness the quality of being considered apart from a specific instance or object
conceptional,
ideational,
notional being of the nature of a notion or concept; "a plan abstract and conceptional"; "to improve notional comprehension"; "a notional response to the question"
conceptual being or characterized by concepts or their formation; "conceptual discussions"; "the schizophrenic loses ability to abstract or do conceptual thinking"; "sex is a notional category, gender is a grammatical category"
ideal constituting or existing only in the form of an idea or mental image or conception; "a poem or essay may be typical of its period in idea or ideal content"
abstract -
not representing or imitating external reality or the objects of nature; "a large abstract painting"