well-balanced (adj.)

• assured
• balanced
• coequal
• collected
• commonsense
• composed
• confident
• cool
• coolheaded
• coordinate
• equal
• equanimous
• equilateral
• even
• fast
• fiducial
• finished
• firm
• harmonious
• imperturbable
• levelheaded
• logical
• philosophical
• poised
• practical
• pragmatic
• predictable
• proportioned
• rational
• reasonable
• regular
• reliable
• sane
• secure
• self-assured
• self-confident
• self-possessed
• sensible
• sober
• solid
• sound
• stable
• steadfast
• steady
• substantial
• symmetric
• together
• unflappable
• unflinching
• uniform
• unshakable
• unwavering
• well-set