为一组给定的英语单词编写一篇类似词典的文本，解释单词的意思及其用法。
给定一组英语单词：inscrutable、ebullient、loquacious、intrepid、callow
inscrutable - difficult to understand or interpret; mysterious. e.g. "his inscrutable smile gave nothing away."

ebullient - cheerful and full of energy; exuberant. e.g. "her ebullient personality was infectious and uplifted everyone around her."

loquacious - tending to talk a great deal; talkative. e.g. "she was so loquacious that it was hard to get a word in edgewise."

intrepid - fearless; adventurous. e.g. "the intrepid explorer climbed the treacherous mountain without hesitation."

callow - inexperienced and immature. e.g. "he was just a callow youth, lacking the wisdom and insight of someone with more life experience."