IPA: /ˈsiːsɪk/
KK: /ˈsiːsɪk/
Feeling ill or nauseous because of the movement of a boat or ship on the water.
She felt seasick during the boat ride across the lake.
Seasick → It is formed from "sea" (from Old English "sǣ", meaning the large body of saltwater) and "sick" (from Old English "sēoc", meaning ill or unwell). The word "seasick" describes the feeling of being ill due to the motion of the sea.
Imagine being on a boat in the vast 'sea' and feeling 'ill' — that's what seasick means.