incessant

definition: 
uninterrupted in time and indefinitely long continuing
sentence: 
This incessant belching expels an impressive volume of greenhouse gases—mostly methane and carbon dioxide.
Fourteen large fires are burning, mostly in the scorched northern half of the state, and California's incessant drought is only making matters worse.
difficulty: 
easy
toefl frequency: 
2
toefl classification: 
adverb: 
incessantly
adjective: 
incessant
adverb sentence: 
The deeper in we climb the more incessantly the air monitor chirps, as oxygen percentage gets lower and fresh air gets farther away.