“ Spend ” is the act of using up or allocating something, like when you spend money on groceries or spend time reading a book. “ Spent,” in contrast, indicates that this action has been completed, as in “I spent all my savings” or “He is spent after the marathon,” the latter showing the adjective form.

The first meaning of the word spend is to use up, consume, disburse, expend, dispose of money or resources while the other meaning is to pass time in a particular manner, place etc. Spent on the other hand is the past and past participle of Spend. In this regard, spend indicates a present action whereas spent indicates a past action.

When someone says they have 'spent' something, they refer to the act of using up or exhausting resources or time in the past. On the other hand, 'spend' is the present tense form and indicates the current act of expending or using resources, time, or energy.

To be aware of thedifference nicely one needs to understand a bit more between the two the words.Spend is an irregular verb that indicates the cost of money or passing of timein a specified manner or in a specific location, whereas Spent is the pastsimple and past participle of spend, though when used as adjective it meanssomething that’s spent has been used so that it no longer has any power oreffectiveness.

"Spended" is incorrect; the correct past and past participle of spend is "Spent," meaning to have used up money, time, or energy.