Do you read the Tips & Notes? This is from To be pl.:
In the plural nominative form, soft adjective endings stay the same -í across all genders. The hard adjectives differ in endings between the genders predictably:
- -í in animate masculine, e.g., mladí muži (young men)
- -é in inanimate masculine, e.g., velké stromy (big trees)
- -é in feminine, e.g., mladé ženy (young women)
- -á in neuter, e.g., malá zvířata (small animals)
The consonant shift from k to c also impacts the animate masculine hard adjective before the -í ending. Thus we get from velký kluk (big boy) to velcí kluci (big boys).
"velicí" is a collection of masculine animate entities, "veliká" is for neuter objects. Feminine objects would be "veliké" and there is no distinction of animacy in the feminine gender. I mean, all this information is comprehensively shown in the Tips & Notes - as well as in the excerpt shown just above this, in nueby's comment.