incapable of being perceived by the senses especially the sense of touch- James Jeans
同义词：intangible
imperceptible to the senses or the mind
not perceptible to the touch
impalpable详细解释
im.pal.pa.ble adj.（形容词）Not perceptible to the touch; intangible.摸不出来的；触摸不到的Difficult to perceive or grasp by the mind.难懂的：难以理解的或隐晦难懂的 【引伸】 impal.pabil.ity n.（名词）impal.pably adv.（副词）
