(bound form) disease; ailment; (bound form) swift; (literary) to hate;
Depicts a person (大) being shot by an arrow (矢). The 大 component was later replaced with meaning component 疒. Based on the original meaning "injury; wound". The meaning of this character has shifted over time and now means "illness".
《說文》：“疾，病也。从疒，矢聲。，古文疾。，籀文疾。”
injury; wound