suffocating
adjective
[ ˈsʌfəkeɪtɪŋ ]
• causing difficulty in breathing.
• "the suffocating heat"
suffocate
verb
• die or cause to die from lack of air or inability to breathe.
• "they suffocated in their sleep"
Origin:
late 15th century (earlier (late Middle English) as suffocation ): from Latin suffocat- ‘stifled’, from the verb suffocare, from sub- ‘below’ + fauces ‘throat’.