unshaken (adj.)

• abiding
• calm
• constant
• coolheaded
• failing
• firm
• fixed
• flinty
• immovable
• inflexible
• loyal
• nerveless
• relaxed
• rock-steady
• set
• settled
• staunch
• steadfast
• steady
• steely
• true
• unabated
• unbending
• unblinking
• undiminished
• unexhausted
• unfaltering
• unflagging
• unflappable
• unflinching
• unquestioning
• unshrinking
• unstrained
• unswerving
• unwavering
• unyielding