Stifling

Adjective

 * 1) Describing something that stifles.

Verb
stifling

Thesaurus
airless, breathless, breezeless, choking, close, constrictive, contrary, counterproductive, crosswise, extinguishment, hindering, hindersome, humid, ill-ventilated, in the way, inhibiting, inhibitive, interrupting, interruptive, muggy, obstructing, obstructive, obstruent, occlusive, oppressive, overpowering, quashing, quenching, repressive, restrictive, smothering, smudgy, squashing, squelching, sticky, strangling, stuffy, suffocating, sultry, suppression, suppressive, troublesome, unbearable, unendurable, unvented, unventilated, windless