Definition of "unbridegroomlike"

Shaking himself from his wife, Monk traversed the passages from the chapel to the tower of the fortress alone in a very unbridegroomlike way to his apartment, […]

1844, Hampton Court; Or, The Prophecy Fulfilled, page 247

Earl Richard's unbridegroomlike behaviour on his wedding night, and his agreeable discovery on the morrow, will remind the ballad reader of the gentle Sir Gawaine, […]

1846, William Motherwell, Minstrelsy, Ancient and Modern, page 251

Then the bridegroom came slowly up the walk, wearing a very unbridegroomlike aspect, […]

1870, Marion Harland, Helen Gardner's Wedding-day, page 139