IPA: /hɑːrdˈwɜːrkɪŋ/
KK: /hɑrdˈwɜrkɪŋ/
A person who puts a lot of effort and dedication into their work, often completing tasks efficiently and effectively.
She is a hardworking student who always completes her assignments on time.
Hardworking → It is formed from "hard" (from Old English "heard", meaning solid or strong) and "working" (from the verb "work", which comes from Old English "wyrcan", meaning to perform or act). The word "hardworking" describes someone who is solidly engaged in their tasks and puts in a strong effort.
Think of someone who is 'solid' ('hard') in their efforts and 'performing' ('working') diligently — that's what hardworking means.