frail has 5 distinct synonyms spread across 2 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is robust.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
easily broken or damaged or destroyed
“a kite too delicate to fly safely”
Synonyms, antonyms and the broader and narrower relations for frail come from Princeton University’s WordNet. Full sources and licences.
the weight of a frail (basket) full of raisins or figs; between 50 and 75 pounds
a basket for holding dried fruit (especially raisins or figs)