irrepressible

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[edit] English

From ir- +‎ repressible.

irrepressible (not comparable)

Not containable or controllable.
- 1858, Charles Dickens, Nicholas Nickleby,
  
  "...here the two friends burst into a variety of giggles, and glanced from time to time, over the tops of their pocket-handkerchiefs, at Nicholas, who from a state of unmixed astonishment, gradually fell into one of irrepressible laughter...