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"weakly" is also used as a crossword clue. If that's what you saw, the answer is often lamely (6 letters).
Definitions
in a weak or feeble manner or to a minor degree
Word origin
From Old English wāclīċe (“weakly”), equivalent to weak + -ly (adjectival suffix); compare Old English wāclīċ (“weak; ignoble; mean”), and Old Norse veikligr (“weakly; sick”); both ultimately from Proto-Germanic *waikalīkaz (“weakly; weak”).
Used in a sentence
“I lay in weakly case and confined to my bed for four months before I was able to rise and health returned to me.”
“I'd always been but weakly, / And my baby was just born; / A neighbour minded her by day, / I minded her till morn.”
“"Oh, a huge crab," Jacob murmured—and begins his journey on weakly legs on the sandy bottom.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Without much strength”6 letters
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