formative
adjective
[ ˈfɔːmətɪv ]
• serving to form something, especially having a profound influence on a person's development.
• "his formative years"
Similar:
developmental,
developing,
growing,
mouldable,
malleable,
impressionable,
susceptible,
determining,
controlling,
influential,
guiding,
decisive,
forming,
shaping,
moulding,
determinative,
formative
noun
• a formative element.
Origin:
late 15th century: from Old French formatif, -ive or medieval Latin formativus, from Latin formare ‘to form’ (see form).