impalpable

adj. 无法触及的，不易理解的

immune, immunity, immunization, immunization, immunisation, immunize, immunize, immunise, immunology, immure, immutability, immutable, immutably, imp, impact, impact on, impair, impaired, impairment, impala, impale, impalement, impanel, impart, impartial, impartiality, impartially, impassable, impasse, impassioned, impassive, impassively, impassiveness, impassivity, impassivity, impatience, impatient, impatiently, impeach, impeachable, impeachment, impeccable, impeccably,