impalpable
[adjective]
Synonyms: imperceptible, imponderable, inappreciable, indiscernible, insensible, intangible, unapparent, unappreciable, unobservable, unperceivable, fine, powdery, pulverized

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Antonyms: palpable

[TahlilGaran] English Synonym Dictionary ▲

im‧pal‧pa‧ble /ɪmˈpælpəbəl/ adjective formal

1. impossible to touch or feel physically Antonym : palpable

2. very difficult to understand

[TahlilGaran] Dictionary of Contemporary English ▲