In a manner that shows disapproval, regret, or lamentation; with a deploring attitude.
From deplorable + -ing + -ly, or from deplorar + -ingly (a more emphatic adverbial formation). The -ingly ending combines -ing and -ly.
The -ingly suffix creates adverbs with extra emotional intensity—compare 'deplorably' (how deplorable) with 'deploringly' (while deploring)—a subtle distinction English speakers often feel without knowing the grammar rule.
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