insidiously
🇺🇸
/ɪnˈsɪdiəsli/
🇬🇧
/ɪnˈsɪdiəsli/
in a sneaky way that causes harm without being noticed
Insidiously, the disease spread throughout the community, causing many people to fall ill.
這個疾病悄悄地在社區中傳播,導致許多人生病。