To make somewhat weak or give a weak quality to something (archaic or rare).
Blend of enfeeble + -ish (a suffix meaning 'somewhat' or 'somewhat like'). This is an obsolete or highly specialized formation that would have meant a milder or partial weakening.
The -ish suffix is wonderfully vague—while 'enfeeble' means completely weaken, 'enfeeblish' would suggest a partial or subtle weakening, like how 'foolish' isn't fully being a fool. It's a word that probably died because English preferred clearer alternatives.
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