suffocative
  (a.)喘不過氣的,令人窒息的
  suf·fo·ca·tive /-ˌketɪv/ 形容詞
  Suf·fo·ca·tive a. Tending or able to choke or stifle. “Suffocative catarrhs.”
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  suffocative
       adj : causing difficulty in breathing especially through lack of
             fresh air and presence of heat; "the choking June
             dust"; "the smothering soft voices"; "smothering heat";
             "the room was suffocating--hot and airless" [syn: smothering,
              suffocating]