Those long suburbs melting indefinably away into the capital forbid all surprise.
Somehow the moonlit stillness of the forest had altered indefinably.
The gesture was indefinably reminiscent of Dallisa, and for the first time I saw the likeness between them.
Reginald was changed—vaguely, almost indefinably, but certainly changed.
He felt like a different man and looked to her indefinably strange when he faced her again quietly.
On this page you'll find 17 synonyms, antonyms, and words related to indefinably, such as: covertly, darkly, dingily, dully, duskily, and gloomily.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.