single word requests - Expression for a "smiling face tiger"

The Chinese expression "smiling face tiger" (笑面虎) is defined in English at one website as "an outwardly kind but inwardly cruel person".

More broadly it doesn't need to refer to someone who is actually positively cruel. The phrase might be used to refer to a person who superficially appears nice/gracious/easygoing/etc., but actually is not at all nice/gracious/easygoing/etc.

Any similar expression/word/idiom in English?

Edit to elaborate: One suggested answer in "wolf in sheep's clothing". This is perhaps the closest English translation (especially since it involves animals) but I think this English/European idiom has an emphasis on the fact that the wolf is deliberately disguising himself in sheep's clothing, in order to deceive someone and achieve some malicious end.

What I am thinking of is someone less malicious than a "wolf in sheep's clothing" (but can nonetheless--though not usually--be just as harmful). Examples:

He is always smiling, greeting you, and saying "Good morning, how do you do?" and generally being absolutely courteous.

When he spills some coffee on your shirt he might say, "Oh my goodness! I am SO terribly sorry! I am such an absolute and horrible klutz! Please let me wash your shirt for you!" (but with no intent of actually doing so, knowing that you will probably reject the offer).

He often offers to help you out or do you favors (again with no intent of doing so).

When you inadvertently cause him some inconvenience, he might say "Oh that is no problem at all! Absolutely no problem at all!" and keep smiling and seem unperturbed the whole time (but in fact he is extremely peeved and if you provoke him just a little bit more, he is liable to abruptly erupt in fury).

These are just some examples. You can probably think of more.

Such a person does this sort of thing on an everyday basis. Unlike a "wolf in sheep's clothing", he has no malicious intent to disguise himself or to seriously harm anyone else. Nonetheless, he has somehow acquired the art of delivering a very favorable first impression and being very nice with his words and superficial acts. But when a problem actually surfaces, it is quickly revealed that he is not very nice after all.

Is there a word/phrase for "unperformant"?

As a software engineer, I need to sometimes describe a piece of code as something that lacks performance or was not written with performance in mind. Example: This kind of coding style leads to unmaintainable and unperformant code. Based on my Google searches, this isn't a real word. What is the correct way to describe this? EDIT My usage of "performance" here is in regard to speed and efficiency. For example, the better the performance of code the faster the application runs. My question and example target the negative definition, which is in reference to preventing inefficient coding practices. Answer This kind of coding style leads to unmaintainable and unperformant code. In my opinion, reads more easily as: This coding style leads to unmaintainable and poorly performing code. The key to well-written documentation and reports lies in ease of understanding. Adding poorly understood words such as performant decreases that ease. In addressing the use of such a poorly ...

nouns - what do you call the person who passes the trophies to the prize giver/presenter?

The person who gives out the trophies to the winners are called award presenters. So what do u call the person who passes the trophies to the presenter? Thanks!

Is 'efficate' a word in English?

I routinely hear the word "efficate" being used. For example, "The most powerful way to efficate a change in the system is to participate." I do not find entries for this word in common English dictionaries, but I do not have an unabridged dictionary. I have checked the OED (I'm not sure if it is considered unabridged), and it has no entry for "efficate". It does have an entry for "efficiate", which is used in the same way. Wordnik has an entry for "efficate" with over 1800 hits, thus providing some evidence for the frequency of use. I personally like the word and find the meaning very clear and obvious when others use it. If it's not currently an "officially documented" word, perhaps its continued use will result in it being better documented.

Notes

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