1. The most idiomatic American English way to say "awesome" is indeed "awesome," which is equivalent to saying "that's so strong" or "that's so impressive."
2. For a slightly lesser degree of awesomeness, one can use "terrific" or "cool."
3. An alternative expression is to use "something," as in: "You're really something," "He is really something," or "That's something." Such phrases are akin to saying "a person of note" or "really impressive."
4. Please note that the above expressions are all current, colloquial American English terms. They are based on my years of watching American TV series and listening to everyday speech.
5. These phrases are not typically found in Chinese-English dictionaries, but using them in conversation will certainly catch the attention of native speakers and enhance their opinion of you!
