1. In an unaccountable manner
   "in the book, a tycoon unaccountably becomes the hero's friend"

See also: unaccountable

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• high-octane
• high-pass filter
• high-performance
• high-pitched
• high-potential
• high-power
• high-powered
• high-pressure
• high-priced
• high-principled
• high-protein diet
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• high-resolution
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• high-sounding
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• high-speed steel
• high-spirited
• high-spiritedness
• high-stepped
• high-stepping
• high-strength brass
• high-strung