Adverb
In an inscrutable manner.
Source: Webster's dictionaryNo rising star in the political firmament ever shone more brightly than Oswald Mosley, none promised more surely to soar to the heavens – and none fell to earth with so deadening a thud. Never were such rich talents so wretchedly squandered. Never did success turn to failure so inscrutably. Oswald Mosley
The first half of the 1960s was the apogee of what might be termed the Age of Cool - as defined by that quality of being simultaneously with-it and disengaged, in control but nonchalant, knowing but ironically self-aware, and above all inscrutably undemonstrative. Martin Filler
Inscrutably involved, we live in the currents of universal reciprocity. Martin Buber