Les Adjectifs:

intelligent
MASC.SING
genereux
bavard
sympa
egoiste
bete
diligent
paresseux
timide
bavard
mechant
beau
gris
bleu
rouge
moche
orange
marron
super
bon marche

MASC.PL
genereus
bavards
sympas
egoistes
betes
diligents
paresseuses
timides
mechants
beaus
grisis
bleus
rouges
moches
oranges
marrons
supers
bon marches

FEM.SING
genereuse
bavarde
sympae
egoiste
bete
diligente
paresseuse
timide
mechante
beaue
grise
bleue
rouge
moche
orange
marrone
supere
bon marche

FEM.PL.
genereuses
bavardes
sympaes
egoistes
betes
diligentes
paresseuses
timides
mechantes
beaues
grises
bleues
rouges
moches
oranges
marrones
superes
bon marches

Please make any corrections, I am terrible at adjectifs in french:(

I looked at the lists, which surely has taken quite an effort to do.

This list seems quite challenging, in the sense that it contains quite a few "pièges", or traps which will and should trip anyone learning French in the first or second year.

I will give a few corrections as a guide, to give you a chance to verify your work. You can complete the rest using a French-French dictionary (see below). Feel free to post for checking.
You are better off posting them one beside the other. It is easier to correct, and gives you a better mental image for memorizing.
Here are some corrections:
masc. sing., pl. fem.sing. fem.pl.
intelligent, -s, -e, -es.
(Means that intelligent is the root word, intelligents is masculine plural, intelligente is feminine singular, and finally intelligentes is feminine plural).
intelligent, -s, -e, -es
généreux, -eux, -euse, -euses
bavard, s, e, es
sympa, s, sympa, s
égoïste, s, égoïste, s
rouge, s, rouge, s
orange, inv.
marron, inv.
super, inv.
bon marché, inv.

There is a certain rule about colours that originate from nouns. Colours that originate from nouns (marron, orange, etc.) are "invariable", i.e. they do not change with gender nor number.
"Des robes orange", "des maisons marron", etc. These are exceptions to this rule (i.e. colours that are nouns that vary).
Écarlate, mauve, pourpre, rose have become adjectives, and so are variable according to the gender and number.
Examples: des rubans mauves.
(ref: Grevisse, Précis de grammaire française)
NOTE ON FRENCH-FRENCH DICTIONARIES:
Many of the words can be easily found in a French-French dictionary, which has the advantage of giving the adjective's feminine form, and noting the exceptions. The English-French translation dictionaries do not usually give this kind of detail, that is probably why you may be having some difficulty with adjectives. The difficulty is more finding the information than learning it.

If you do not have access to "Le dictionnaire le Robert", which I consider the excellent for its price. The paper version or software version cost about $50, available from most book-stores. If you prefer to use an on-line dictionary, there are probably many available, but one good one is the Le Littré, which is an authority on the subject. The software version cost about 100€ but an abridged version is available on-line for free.
http://littre.reverso.net/dictionnaire-francais/
Here if you look up adjectives (try "intelligent", you will find the masculine and feminine forms. You will have to figure out the plural forms, which are much easier.

Now that you have the tools that will help you learn better, it's time to get on it.

Post anytime if you need verifications or if you need help.

thank you mathmate, you saved my day!

Correction:

" There are exceptions to this rule..."

You're welcome. Post any time!

Here are the corrections to the adjectives you provided:

MASC.SING
intelligent
généreux
bavard
sympa (sympathique)
égoïste
bête
diligent
paresseux
timide
méchant
beau
gris
bleu
rouge
moche
orange
marron
super
bon marché

MASC.PL
généreux
bavards
sympas
égoïstes
bêtes
diligents
paresseux
timides
méchants
beaux
gris
bleus
rouges
moches
oranges
marrons
supers
bon marché

FEM.SING
intelligente
généreuse
bavarde
sympa (sympathique)
égoïste
bête
diligente
paresseuse
timide
méchante
belle
grise
bleue
rouge
moche
orange
marron
super
bon marché

FEM.PL.
généreuses
bavardes
sympas
égoïstes
bêtes
diligentes
paresseuses
timides
méchantes
belles
grises
bleues
rouges
moches
oranges
marronnes
superes (not a valid form)
bon marché