обосно́вывать

rare #26218

verbimperfective perfective is обоснова́ть

1.
to justify, to substantiate, to give grounds for, to ground
Он подро́бно обосно́вывает своё предложе́ние.
He gives detailed reasons for his proposal.
Imperfective; the perfective is обосновать. Typically used of arguments, proposals and decisions.
2.
to back up (with evidence), to corroborate, to support with facts
Он обосно́вывал свои́ тре́бования расчётами.
He backed up his demands with calculations.
Used when facts, figures or data are adduced in support.

Examples

Автор обосновывает теорию простыми примерами.
The author substantiates the theory with simple examples.
Не надо ничего обосновывать, я тебе верю.
You don't need to justify anything; I believe you.
Он умеет обосновывать свои решения фактами.
He knows how to substantiate his decisions with facts.

Imperative
ты	обосно́вывай
вы	обосно́вывайте

Active present	обосно́вывающий	substantiating, justifying, grounding, proving
Active past	обосно́вывавший	substantiating, justifying, that substantiated, that justified
Passive present	обосно́вываемый	being justified, being substantiated, justifiable, provable
Passive past	-
Gerund present	обосно́вывая	while doing (present)
Gerund past	обосновывав обосновывавши	while doing (past)