Definition of unbearably in English:
 unbearably
adverbʌnˈbɛːrəbliˌənˈbɛrəbli
In a way that is impossible or extremely hard to endure.
 the men and their families have suffered unbearably
as submodifier even the nights were unbearably hot
 Example sentencesExamples
-  The movie unfolds at an unbearably slow pace.
 -  The locked-out crowd had two choices: remain uncomfortably warm in the plaza, or crowd into the box-office area and swelter unbearably.
 -  What renders these tales of same-sex love almost unbearably poignant is their constant battle to be retrieved.
 -  Holding unlikely poses or broadly gesticulating, they often whisper inaudibly or shout unbearably.
 -  Usually records of this sort are unbearably cutesy or too steeped in ironic smugness to be enjoyable.
 
  Definition of unbearably in US English:
 unbearably
adverbˌənˈbɛrəbliˌənˈberəblē
In a way that is impossible or extremely hard to endure.
 the men and their families have suffered unbearably
as submodifier even the nights were unbearably hot
 Example sentencesExamples
-  The movie unfolds at an unbearably slow pace.
 -  Usually records of this sort are unbearably cutesy or too steeped in ironic smugness to be enjoyable.
 -  The locked-out crowd had two choices: remain uncomfortably warm in the plaza, or crowd into the box-office area and swelter unbearably.
 -  Holding unlikely poses or broadly gesticulating, they often whisper inaudibly or shout unbearably.
 -  What renders these tales of same-sex love almost unbearably poignant is their constant battle to be retrieved.