amorphous; shapeless
Describes something lacking a fixed or definite shape; used in both literal and figurative contexts.
This substance is amorphous and has no crystalline structure.
His ideas are still shapeless.
amorphous carbon
Compound of 無 (mu, 'without') and 定形 (teikei, 'fixed form'). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern.