Hardworking means putting steady effort into everything. A hardworking student, hardworking families, honest and hardworking.
It praises consistency rather than brilliance, which is why it is the safest thing to say in a reference and the least informative. Hardworking families is a political formula worn smooth by repetition. Note that it is usually written as one word, sometimes hyphenated, and that the compound is straightforwardly hard plus working.
1adjectivehardworkingPutting steady effort into everything.
“She's a hardworking student who does her homework every night without being asked.”
synonyms: diligent, industrious
hardworking is a quality of effort.
Also accepted in games: hard-working
From hard + working.
Etymology from Wiktionary, CC BY-SA