Use the adverb palpably to describe something you can physically feel or otherwise notice quite clearly. If a talent show singer is palpably anxious, it will be a wonderful surprise when she belts out a perfect aria.
The literal meaning of palpably is "in a way that can be felt or palpated," from its Latin root palpare, "touch gently." Feeling a knot that's swelling palpably in your arm gives your doctor a clue about whether it's sprained or broken. It's most common to use this word in a figurative way, for things you can't actually touch: "He was palpably relieved when the test was over" or "The mood at her birthday party was palpably joyous."