あてもなく の訳語→ aimless blindly haphazardly uselessly
のんびり の訳語→ easily good idleness pretty slow
ぼんやり の訳語→ absently aimlessly bit blankly blurred confusedly daze dim faintly foolishly fume listlessly misty numbly stupor uncertain unobservant vacantly vaguely
ぼんやりと の訳語→ abstraction barely distant distantly dully ghostlike hazily indefinite lazily miserably silently spectral
むなしく の訳語→ futilely impotently vainly
ものうげな の訳語→ half-hearted languid lazy
何気なく の訳語→ casual casually spontaneously unconscious unconsciously