IPA: /ˈdʒɛlɪdli/
KK: /ˈdʒɛlɪdli/
In a very cold or icy way.
The water flowed gelidly down the mountain, freezing everything in its path.
Gelidly → It is formed from "gelidus" (from Latin, meaning icy or cold) and the adverbial suffix "-ly" (meaning in a manner of). The word "gelidly" means in a manner that is icy or extremely cold.
Think of the Latin word for icy, 'gelidus', to remember that 'gelidly' describes something done in a very cold manner.