stiffly
Definitions
In a manner that lacks flexibility, ease, or grace.
In a formal, reserved, or constrained way.
Examples
He sat stiffly in the wooden chair, trying to hide his discomfort.
The soldier stood stiffly at attention as the general walked past.
Synonyms
rigidly formally awkwardly stiltedly unbendingly primly precisely
Antonyms
loosely flexibly informally naturally fluidly relaxed limply