In my previous post, I wrote about らしい and そうだ, which follows after information and indicates that the speaker is not sure about the truth. And らしい also means "just like as something" or "typical" when it follows a noun.
We also say ～っぽい/...ppoi/ in casual conversations. It has the same meaning as らしい and そうだ, but it sounds very casual.
らしい and そうだ is usually used when the speaker got information from others, while っぽい is also used when the speaker just came to the conclusion.
/Yamada san, taichou ga warui rashii yo/
/Yamada san, taichou ga warui souda yo/
I've heard that Mr.Yamada is sick.
/Yamada san, taichou ga warui ppoi yo/I've heard/It seems that Mr.Yamada is sick. (Perhaps the speaker heard about it, or just thought Mr.Yamada is sick because he saw Mr.Yamada coughing or something.)
らしい and ぽい can also be translated as "-ish" or "-like".
/nandaka kaze ppoi na/
I think I'm coming down with a cold.
/netsu ppoi toki wa yasunda hou ga ii/
You'd better get some rest if you feel feverish.
女(おんな)らしい/女(おんな)っぽい both mean "feminine". 女らしい is usually used to describe a woman who has ideal feminine traits, so it won't be used for men. 男らしい(manly, masculine) is used for men, not for women.
On the other hand, 女っぽい/男っぽい can be used for both men and women who are feminine/masculine.
So ねこらしい describes the typical and common traits of ねこ(cats), and ねこっぽい describes something that is like cats. For example, my dog sometimes behaves like a cat. We say he has ねこっぽい性格(せいかく) "cat-like personality". We don't say ねこらしい性格 because he actually is a dog, not a cat. If I had a cat which has a typical cat's characteristics, then I would say she has ねこらしい性格.
It might be confusing but let me add two more words, ようだ and みたいだ. They also indicate the speaker got information from others. I've written about them before, but let me introduce them again.
/konban yuki ga furu rashii/
/konban yuki ga furu souda/
/konban yuki ga furu youda/
/konban yuki ga furu mitaida/
※降（ふ）る/furu/ to fall
So, what's the difference? I've already told you about (1)らしい and (2)そうだ. You've heard about it from someone else. To be specific, (2)そうだ sounds that the speaker is sure about the information, but (1)らしい sounds unsure.
(3)ようだ and (4)みたいだ are the same. (4)みたいだ is often used in a conversation. They are used to show the speaker's conclusion drawn from his experience or his sence.
/ano futari wa kenka shita souda(rashii)/
I've heard that they had a falling out.
/ano futari wa kenka shita youda(mitaida)/
It seems that they had a falling out.
I just remembered another meaning of そうだ, but it would be too long, so I'll write about it next time! ;)