This is the 2567th most frequent Japanese word.
容易
"容易" means "easy" or "simple" in English.
In this sentence, '容易' is used as an adverb '容易に' to describe the ease with which the action (solving the problem) was performed.
その問題は容易に解決できた。
That problem was easily solved.
Here, '容易' is an adjective, modifying '仕事' (job) to indicate that the speaker seeks a task that is simple or requires minimal effort.
容易な仕事を探しています。
I am looking for an easy job.
In this use, '容易' is describing the overall nature of the task (operating the machine) as uncomplicated or simple.