stifling

nouns

forceful prevention; putting down by power or authority
"the suppression of heresy"; "the quelling of the rebellion"; "the stifling of all dissent"
crushing, quelling, stifling, suppression
is derived from
stifle

adjectives

characterized by oppressive heat and humidity
"the summer was sultry and oppressive"; "the stifling atmosphere"; "the sulfurous atmosphere preceding a thunderstorm"
stifling, sulfurous, sulphurous, sultry