Suffocative

a.

1.

Tending or able to choke or stifle.

Adj.

1.

suffocative - 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" Synonyms: smothering, suffocating

breathless, dyspneal, dyspneic, dyspnoeal, dyspnoeic, smothering, suffocating