IPA: /ˈmʌɡɪli/
KK: /ˈmʌɡɪli/
In a way that is hot and humid, making the air feel uncomfortable.
It was muggily warm outside, making everyone feel sticky and tired.
Muggily → The word 'muggily' is derived from 'muggy' (originating from the dialectal 'mug' meaning warm and humid) with the suffix '-ly' (meaning in a manner of). Thus, 'muggily' describes the manner in which the weather is warm and humid.
Think of 'muggy' as describing warm and humid weather, and remember that 'muggily' means experiencing that kind of weather.