Texture - Physical consistency

[Txur’Itan]

Rough - This word in english does a ton of work but (ke smooth, course, turbulent, high grit, incomplete, pitted, rocky)
Smooth - (ke rough, even, not bumpy, silky smooth)
Hard - Dense material like stone or metal or even bone could be thought of as hard items (euphemisms like hard headed lead to terms which mean stubborn or stupid like skxawng)
Soft - Prrton seems to have uncovered something here related to moss (Na'vi word for moss), but I was not sure.
Thick - a relative term - the cloud cover on the first shuttle flight landing in the movie was thick, the jungle had somewhat thick vegetation, the roots for home tree where very thick.
Thin - The Na'vi are very thin, the bow string is made of thin animal flesh, the tendrils on a queue are thin.
Chewy - Meats, bugs or some plants could be chewy
Gooey - tree saps, wet blood
Sticky - the adhesive quality of sap, and drying blood
Crunchy - Taylu, nuts, bugs when you step on them
Tough - higher durability, resistance to abrasive or fracturing forces
Leathery - The quality of materials made from Pandora animal skins
Flexible - The ability of something to bend, like bows, limbs, (euphemisms in English lend this word towards uses like the opposite of being stubborn.)

['eylan na'viyä]

(E)Heavy/Light (D)Schwer/Leicht
komplex inner structure: eg:porous/folded/fibrous(E) (D)komplexe innere struktur: zb:porös/gefaltet/fasrig

destinction between Flexible: returns to original shape
and Flexible: changes its shape after bending

[Kerame Pxel Nume]

destinction between Flexible: returns to original shape
and Flexible: changes its shape after bending

In material science there are the following terms.

• elastic, that are materials which return into their original shape if a deforming external force if removed
• plastic, that are materials which change their shape on external force and retain that shape if the force is removed.
• flexibility defines the force required to gain a certain deformation - and rigidity is the opposite. If sth. is flexible, then usually this means you can deform it with little force.

Also materials may be brittle, i.e. they shatter easily if flexed to much. For example the insect wings used for arrow fins are probably brittle, whereas the feathers used for the same purpose are not. Arrowheads made of obsidian/stone are brittle, while arrowheads made of metal als plastic.

[EDIT]: Fixed a typo, added colour coding, some more explanation for "flexible"