desert = the good?

i refuse to tell you what it means because you'll translate

1. Tired with all these, for restful death I cry,
Tired with all these = exhausted, wearied, disgusted with all these - then follows the list of social evils with which he is tired. Possibly with a suggestion of attired with, in the sense that the evils cling to him like clothing, and he cannot divest himself of them.

2. As to behold desert a beggar born,
As = as, for example, all these following.
desert = a deserving person, a worthwhile person. In each succeeding line either praiseworthy or degenerate qualities are personified. Thus needy nothing, purest faith, gilded honour, maiden virtue, right perfection etc. all refer to the person or persons endowed with such characteristics.
a beggar born = born into poverty.

3. And needy nothing trimm'd in jollity,
needy nothing = a nonentity who is needy because he is lacking in all good qualities. At first glance it appears that the phrase suggests the opposite of that intended, for being in a list of socially desirable types whom society has downtrodden, one automatically accepts it as being of the correct type to fit the general flow of the poem i.e. one of the better and praiseworthy examples. Further consideration shows that this is not so, and needy nothing turns out to be one of the nasties who has managed to get himself kitted out in the latest fashion, no doubt at the expense of desert in the line above .
trimm'd in jollity = (undeservingly) done up in frivolous and expensive clothes and ornaments.

4. And purest faith unhappily forsworn,
purest faith = one who exhibits trust and trustworthiness; one who is pure in heart.
unhappily = through evil fortune, unluckily; wretchedly.
forsworn = tricked by false promises, betrayed.

5. And gilded honour shamefully misplaced,
As in line 3, gilded honour is not an example of virtue ill-treated, but of unworthiness well rewarded. Gilded honour stands for the pomp and paraphernalia of office and authority, the gold regalia of office, but here it is misplaced, because it has been bestowed on those who are not fit to receive it.

6. And maiden virtue rudely strumpeted,
maiden virtue = unblemished virtue; an innocent maiden.
rudely strumpeted = forced to become a whore, proclaimed a whore. Figuratively, virtue is forced into evil ways. The resemblance of the word strumpet to trumpet hints at the possibility of public shaming of the innocent.

7. And right perfection wrongfully disgraced,
right perfection = genuine, honest perfection.
wrongfully = sinfully, evilly, unjustly.

8. And strength by limping sway disabled
strength = the strength of knowing the right course of action.
limping sway = influence, which is typified by a crippled, shuffling figure working behind the scenes. The irony is that strength, which is hale and hearty, is disabled by influence and corruption, which is limping and crippled, but nevertheless manages to make strength like himself.

9. And art made tongue-tied by authority,
art = skill, knowledge. A person who possesses these. The word was less often applied to what we would call the creative arts.
authority = a person in authority. This could refer to censorship, which did operate in Elizabethan times, albeit rather erratically.

10. And folly, doctor-like, controlling skill,
folly = stupidity, ignorance.
doctor-like - as an academic doctor; pretending to be learned. Skill is used by Shakespeare of the physician’s art also, so the reference could here be to a doctor of medicine.
controlling = restraining, exercising authority over, restricting, hampering. skill - used in a general sense to signify those who have knowledge, those who are skilled in a branch of science. But perhaps the reference is more to an academic situation, in which a person flaunting academic dress controls those who are more knowledgeable than him, but who do not have such a high academic standing. In the traditional personification of Folly, such as that depicted in Erasmus’s In Praise of Folly, he was given learned pomposity and academic garb to suit it.

11. And simple truth miscalled simplicity,
simple truth = plain truth, unadorned truth. miscalled = wrongfully named.
simplicity = stupidity, idiocy.

12. And captive good attending captain ill:
captive = having been captured; enslaved, having no freedom; attending = serving in a menial capacity; taking instruction from.
captain ill = evil (an evil person) in a position of authority. The title referred to a military rank, but was often used in a more general sense to mean a military person in high authority,

13. Tired with all these, from these would I be gone,
Wearied with all this graft and corruption, I wish to escape from it all.

14. Save that, to die, I leave my love alone.
Save that = except that.
to die = by dying; if I die.
I leave my love alone = I abandon my love and leave him defenceless; the only thing that I regret leaving is my love.

Excellent!
Thank you.