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English word useful comes from English use, English -ful
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use (English)
(dated) To behave toward; to act with regard to; to treat.. (intransitive) To consume a previously specified substance, especially a drug to which one is addicted.. (intransitive, now, rare, literary) To habitually do; to be wont to do.. (intransitive, past tense with infinitive) To habitually do. See used to.. (reflexive, obsolete) To become accustomed (to), to accustom oneself (to).. [...]
-ful (English)
Used to form adjectives from nouns. Full of, tending to, or thoroughly possessing the quality expressed by the noun.. Used to form nouns from nouns meaning “as much as can be held by what is denoted by the noun”. Used to form nouns indicating a great deal of the quantity expressed by the noun.
useful (English)
Having a practical or beneficial use.