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Synonyms for Intangible (same or very similar meaning)

WordNet sense 1 (assets that are saleable though not material or physical):
intangible asset

WordNet sense 2 (incapable of being perceived by the senses especially the sense of touch):
impalpable

WordNet sense 3 (impossible to identify):
unidentifiable

WordNet sense 4 (lacking substance or reality; incapable of being touched or seen):
nonphysical

WordNet sense 5 (not consisting of matter):
nonmaterial


From the ODE community, based on WordNetadd/edit