IPA: //ˈpleɪɡuːɪli//
KK: /ˈplæɡuːɪli/
In a manner that is annoying or troublesome.
The constant noise from the construction site plaguily interrupted my concentration.
The word 'plaguily' is derived from 'plague' (from Old French *plague*, meaning a disease or affliction) and the suffix '-ly' (meaning in a manner of). Thus, 'plaguily' refers to something done in a manner that is reminiscent of or related to a plague, often implying a harmful or detrimental effect.
Think of 'plague' as a harmful disease and remember that 'plaguily' means doing something in a way that is harmful or detrimental, just like a plague.