“Oniomania” should remind you of someone who is obsessed with owning things.
“Megalomaniac” should remind you of Megawatt and watt is the S.I. unit of Power. Thus, megawatt refers to mega power.
Livery rhymes with shivery. When one is shivery, it is apparent from their outward condition. Similarly, livery tells us about the rank and status of the person clad in that.
You are anxious that there is a trap just ahead of you. Hence, the feeling of trepidation!
A delusion is delusive! A delusion is far moved from reality. It is a lie!
In Chemistry, cathode in the terminal where reduction occurs. Now, no need to understand Chemistry here. Catharsis should remind you of a cathode which helps in reduction of emotional burden. Remember thus!
If you are saying the truth, you would not need to mend anything. But if you lie, you would be termed as a mendacious person who would need to mend and repair many a relationship.
You allay someone’s fears by saying that all is okay. Remember thus: Allay = All Okay!
You assuage by providing assurances about a good future to an aged and weak person. Remember the word “Assuage” using the words “assurance” and “aged”.
Anything that helps in predicting the end would portend the future. Remember thus!