grātuītus -a -um

1. 1

   freely given, free, gratuitous

2. 2

   vain, fruitless, futile

   = ingratus= infelix= irritus ↔ opportūnus↔ commodus↔ habilis↔ idōneus↔ conveniēns↔ ūtilis↔ ūtēnsilis↔ aptus↔ habilis↔ salūber↔ ūtibilis