unnoticeably
un·no·tice·a·ble
U0098800 (ŭn-nō′tĭ-sə-bəl)| Adv. | 1. | unnoticeably - in an imperceptible manner or to an imperceptible degree; "the power of the Secretary of State in London increased gradually but imperceptibly" |
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。