By myself I can be quite persuasive.
With a letter out front, I'm powerful.
With two behind, you'd better act fast.
With three out front, I bring great suffering.
What is this strong word?
By myself I can be quite persuasive.
With a letter out front, I'm powerful.
With two behind, you'd better act fast.
With three out front, I bring great suffering.
What is this strong word?
Again! This is starting to get eerie! The word is
URGE
By myself I can be quite persuasive.
Urges are certainly persuasive
With a letter out front, I'm powerful.
SURGE adds one letter and becomes a powerful force (e.g. power surge)
With two behind, you'd better act fast.
URGENT adds two letters to the back and becomes a force pushing you to move promptly.
With three out front, I bring great suffering.
SCOURGE adds three letters up front and becomes a plague/calamity that spreads suffering.
I have no related pun this time.
By myself I can be quite persuasive.
An OLD person can be quite persuasive, since age brings wisdom - they should be listened to.
With a letter out front, I'm powerful.
GOLD is power: in the immortal words of Artemis Fowl, aurum potestas est.
With two behind, you'd better act fast.
As you get OLDER, you need to act fast before it's too late!
With three out front, I bring great suffering.
A KOBOLD is a wicked mythological creature, which brings suffering to many.
Is it:
An Act
By myself I can be quite persuasive.
A good act (performance) can be persuasive
With a letter out front, I'm powerful.
A Pact : When you make a pact with someone, it's a powerful link.
With two behind, you'd better act fast.
Actor , when an actor play, he needs to remember his lines quickly.
With three out front, I bring great suffering.
An impact : A violent impact can bring suffering
Just realize that there is the word act in one of the line so it's problably the wrong answer
Another possibility (if a bit cheeky)
Tom
By myself I can be quite persuasive.
Tom Riddle was very persuasive to those that followed or opposed him.
With a letter out front, I'm powerful.
Atom, the building blocks of the universe, or an atom bomb is very powerful.
With two behind, you'd better act fast.
Tommy, for tommy gun will make you take cover fast.
With three out front, I bring great suffering.
Bottom - Many a bottom has brought great suffering to those that came after.
Could it be,
Imp
By myself I can be quite persuasive.
Tyrion Lannister in Game of Thrones is an imp and is very persuasive
With a letter out front, I'm powerful.
A pimp holds a lot of power over his girls
With two behind, you'd better act fast.
If someone has to impel you to do something you probably don't want to do it, so do it fast
With three out front, I bring great suffering.
Shrimp. people with shell fish allergies can die from eating a shrimp
I have a feeling I am onto it:
By myself I can be quite persuasive.
WORD - words are very persuasive
With a letter out front, I'm powerful.
SWORD - swords are mighty objects
This one I'm stuck on.
With three out front, I bring great suffering.
KEYWORD - this one is a huge stretch, but people often forget their keywords (passwords?)