abiding calm constant coolheaded failing firm fixed flinty going strong immovable in full force in full swing inexcitable inflexible loyal nerveless never relaxed rock-steady set settled sot staunch steadfast steady steady-handed steady-nerved steel-nerved steely strong-nerved TRUE unabated unallayed unbated unbending unblenching unblinking undeflectable undiminished unexhausted unfaded unfaltering unflagging unflappable unflinching unnervous unquestioning unquivering unshaky unshrinking unstrained unswerving untremulous unwavering unweakened unweakening unwithered unworn unyielding without a tremor