Choose the most appropriate word from the options given below to complete the following sentence:
His rather casual remarks on politics ________ his lack of seriousness about the subject.
answer is option (c)
(a) Masked : Hide under a false appearance - opposite
(b) Belied : Be in contradiction with - not appropriate
(c) Betrayed : Reveal unintentionally - most appropriate
(d) Suppressed: To put down by force or authority - irrelevant