Synonyms for firmly

modified

1. Not easily moved

   immovably, solidly, rigidly, stably, fast, tight, tightly, fixedly, durably, enduringly, substantially, securely, heavily, sturdily, stiffly, inflexibly, unshakably, soundly, strongly, steadily, solid as a rock*, like the Rock of Gibraltar*, there for all time*.

   Antonyms loosely, tenuously, insecurely.

2. Showing determination

   resolutely, steadfastly, doggedly, stolidly, tenaciously, determinedly, staunchly, adamantly, constantly, intently, purposefully, obdurately, persistently, obstinately, stubbornly, perseveringly, pertinaciously, unwaveringly, unswervingly, unchangeably, indefeasibly, with a heavy hand, through thick and thin*.

   Antonyms temporarily*, weakly, feebly.