If an action or situation redounds to your credit or discredit, it gives people a good or poor opinion of you and produces a result that benefits or hurts you.
If you are inundated with something, you have so much of it that you cannot easily deal with it; likewise, if too much rain inundates an area, it causes flooding.
Something that undulates moves or is shaped like waves with gentle curves that smoothly rise and fall.
If something is redundant, it exceeds what is necessary or is needlessly wordy or repetitive.
When you have an abundant amount of something, there is a lot or plenty of it.
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