The phase 'Achilles' heel' means a small problem or weakness in a person or system that can result in failure. The phrase has it origin traced to the legend of Achilles, which tells the talk of Achilles, how he was dipped into the river by his mother, That is in order to make him invulnerable. His heel wasn't covered by the water and he was later killed by a narrow wound to his heel. There is an explanation video available below.
Some words are made up of a root and a suffix: dangerous = root –> danger + ous –< suffix commercial = root –> commerc(e) + al –< suffix In some words with suffixes, the stress stays on the same syllable as in the root. Compare: ‘danger and: ‘dangerous <
The word Parsimonious means very unwilling to spend money or use resources. On the other hand 'Generous is the opposite', meaning to give more of something especially money From the above meaning of each words of option, generous best describes the opposite of parsimonious, as every other option is synonymous to parsimonious There is an explanation video available below.