unwavering (adj.)

• abiding
• arrogant
• assiduous
• assured
• balanced
• calm
• cocksure
• confident
• constant
• continuing
• convinced
• cool
• coolheaded
• decided
• determined
• diligent
• dogged
• enduring
• faithful
• fast
• fiducial
• firm
• fixed
• immutable
• imperturbable
• inalterable
• indefatigable
• indomitable
• industrious
• insistent
• invincible
• lasting
• loyal
• nerveless
• obstinate
• overconfident
• overweening
• patient
• permanent
• persevering
• persistent
• persisting
• persuaded
• pertinacious
• plodding
• poised
• pompous
• positive
• predictable
• preoccupied
• proud
• rapt
• reassured
• relaxed
• relentless
• reliable
• resolute
• rock-steady
• secure
• sedulous
• self-assured
• self-confident
• self-important
• self-reliant
• single-minded
• sleepless
• solid
• sound
• stable
• steadfast
• steady
• stubborn
• substantial
• sure
• tenacious
• tireless
• unafraid
• unblinking
• unconquerable
• undaunted
• undiscouraged
• unfailing
• unfaltering
• unflagging
• unflappable
• unflinching
• unhesitating
• uninterrupted
• unqualified
• unrelenting
• unremitting
• unshakable
• unshaken
• unshrinking
• unsleeping
• unstrained
• unswerving
• untiring
• unwearied
• unwearying
• well-balanced