Adjektive
tougher [ tougher ; toughest ]
toughest [ tougher ; toughest ]
harshest [ harsher ; harshest ]
harsher [ harsher ; harshest ]
crueller [ crueler/crueller ; cruelest/cruellest ]
Verb
to harden [ hardened ; hardened ]
to concrete {Chem.}
أَقْسَى {كمياء}
to solidify {Chem.}
أَقْسَى {كمياء}