Used as the simple past tense and past participle of the verb “buttress”.
buttressedpast participle Functions as an adjective derived from the past participle; can take comparative and superlative forms (more/most buttressed).
The argument was buttressed by solid evidence.
Аргумент был подкреплён надёжными доказательствами.
Used predicatively or attributively to describe something that has been provided with buttresses or otherwise reinforced; not normally gradable.