giving form or shape; forming; shaping; fashioning; molding

a formative process in manufacturing.

pertaining to formation or development

a child's most formative years.

Biology .

capable of developing new cells or tissue by cell division and differentiation

formative tissue.

concerned with the formation of an embryo, organ, or the like.

Grammar . pertaining to a formative.

Grammar . a derivational affix, particularly one that determines the part of speech of the derived word, as -ness, in loudness, hardness, etc.

Linguistics . (in generative grammar) any element, as a word, affix, or inflectional ending, functioning as a minimal syntactic unit that can be used in forming larger constructions.

adjective

destructive , noninfluential

adjective

determinative , developmental , immature , impressible , malleable , moldable , pliant , sensitive , shaping , susceptible , creative , impressionable , plastic