low-key
adjective
[ ləʊˈkiː ]
• not elaborate, showy, or intensive; modest or restrained.
• "their marriage was a very quiet, low-key affair"
Similar:
restrained,
modest,
understated,
muted,
subtle,
quiet,
low-profile,
inconspicuous,
unostentatious,
unobtrusive,
discreet,
circumspect,
played-down,
toned-down,
self-effacing,
relaxed,
downbeat,
easy-going,
modulated,
softened,
laid-back,
low-key
adverb
• to some extent.
• "this is low-key freaking me out"