firmly

Synonyms: durably enduringly fast fixedly hard inflexibly like a rock motionlessly rigidly securely solid solidly soundly stably steadily stiffly strongly substantially thoroughly tight tightly unflinchingly unshakeably

Antonyms: flexibly movably weakly

Synonyms: adamantly constantly decisively doggedly indefatigably intently obdurately obstinately perseveringly persistently pertinaciously purposefully resolutely staunchly steadfastly stolidly strictly stubbornly tenaciously through thick and thin unchangeably unwaveringly with heavy hand

Antonyms: changeably indefinitely waveringly weakly