most useful

advantageous appropriate convenient effective favorable fruitful good handy helpful practical pragmatic profitable proper suitable

utile

all-purpose applied brave commodious fit functional instrumental meet of assistance of service of use practicable propitious purposive salutary serviceable subsidiary suited toward

awkward bad disadvantageous disagreeable harmful hurtful impotent improper inappropriate incapable inconvenient injurious misbehaving unacceptable unfitting unhandy unhelpful unproductive unskilled unsuitable unsuited useless worthless

unusable unvaluable