Simple past tense and past participle of focus.(verb)
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Use "focussed" in a sentence
"Being a low-cost carrier, we'll remain focussed on providing the best prices to customers."
"Remembering that the idea is to remain focussed on your task as much as possible, this process will be easy if you are enjoying what you are doing, or if it requires a lot of concentration."
"This viewpoint usually presents a very impassionate and impersonal story, so here it's very refreshing and eye opening to see it from the two viewpoints of the girl and American, and for the film to remain focussed in this way."