For the alternative meaning, I think you'd say, "The company couldn't make the car safely enough." So yeah, adjective and adverb, I think you're right. For that

For the alternative meaning, I think you'd say, "The company couldn't make the car safely enough." So yeah, adjective and adverb, I think you're right. For that matter, "The company couldn't make the car quickly enough" would resolve the ambiguity in one direction, but I guess not the other.