This is the 3811th most frequent Japanese word.
まとも
Proper; decent; reasonable; direct.
The word 'まとも' here is used to describe the nature of the plan as proper, decent, or appropriate, emphasizing its adequacy for success.
まともな企画が成功につながる。
A proper plan leads to success.
In this sentence, 'まとも' is used to describe the type of job as decent or respectable, highlighting its desirability and standards.
彼はまともな仕事を見つけたいと言った。
He said he wants to find a decent job.
Here, 'まともに' is used as an adverb meaning seriously or properly, implying that the referenced accident should be considered with seriousness and attention.