The word "re-generations" refers to the repetition or revival of a generation or group of people. Its antonyms can be words like deterioration or decline, which signify a loss or deterioration of the generation's or group's characteristics. Another antonym for "re-generations" can be stagnation, which implies no change, growth or development over time. The opposite of re-generation can also be degeneration, referring to a process of declining and breaking down, leading to a decrease in vitality and function. Terms like decay, dwindling, and fading can also be used as antonyms for "re-generations" signifying a decline or loss of energy, power, or strength.