One of the mysteries of the English language finally explained.
1Of God, a person, the spirit, etc.: capable of effective action or resistance; mighty, powerful; mentally strong. Now rare (literary).
2Physically strong; having muscular strength; robust; able to exert or resist force.
3Difficult to deal with, overcome, or refute; reliable, certain, convincing. Now US informal.
Late Middle English; earliest use found in The Wycliffite Bible (early version). From strength + -y.
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