Beneficial, advantageous, or proper; worth doing or necessary.
From 'behoove' plus '-ful' suffix (meaning full of or characterized by). This is an extremely rare formation that adds the standard English adjective-forming suffix to an archaic verb.
This word barely exists even in historical texts—it's so obscure that it's almost a linguistic joke, yet it perfectly demonstrates English's ability to build new words by stacking productive morphemes.
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