different between decidedly vs markedly

English

From decided +? -ly.

decidedly (comparative more decidedly, superlative most decidedly)

In a manner which leaves little question; definitely, clearly.
In a decidedly petulant manner she sat with crossed arms and a frown.
In a decided or final manner; resolutely.
- 1914, Saki, ‘The Lull’, Beasts and Superbeasts:
  ‘We can't,’ said Vera decidedly, ‘we haven't any boats and we're cut off by a raging torrent from any human habitation.’

marked +? -ly

markedly (comparative more markedly, superlative most markedly)

In a marked manner; distinctly, noticeably, conspicuously.
Being markedly different as a teenager can get you taunted; as an adult it can make you famous.

Send