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основательный adj. stresses
gen.	significant (контекст Moscowtran); substantial (a structure is strongly made or built: It was a substantial fence. • The castle was a substantial structure with wings consisting of five and six storeys. 4uzhoj); valid; solid (of a person); thorough; profound; stanch; staunch; bred-in-the-bone; full-bodied; well-heeled; through; compelling (dnv); fundamental; bred in the bone; full bodied; well heeled; four-square; well founded; foundational (Alex_Odeychuk); rugged (robust) As usual, the iPhone 7 is pleasingly rugged. The metallic finish is resistant to scratches and scuffs. 4uzhoj); heavy-duty (If you can't find anything, it might be time for some heavy-duty closet cleaning. (контекстуальный перевод) VLZ_58); dependable (Abysslooker); sound; telling; robust (MichaelBurov); defendable; defensible; judicious; sagacious; steady; stedfast; stable; sted
Gruzovik	stout
Игорь Миг	rock-solid; tough; massive
dipl.	deep
Gruzovik, inf.	bulky
inf.	proper; sizable
Makarov.	good; thoroughgoing
notar.	justified; warranted; well-founded
obs.	steddy
progr.	well grounded (ssn)
psychol.	substantive
road.wrk.	consistent
tech.	firm; meticulous; well-grounded
основательно adv.
gen.	well; thoroughly; plenty; roundly; about right; root and branch; for a full due; to the tips of one's fingers; fathoms deep; well and truly; through and through; staunchly (Notburga); like fun; richly; up and down; ultimately (cognachennessy); cold (If you know your stuff cold, they'll never catch you off guard... VLZ_58); soundly (Liv Bliss); tellingly; capitally; completely; profoundly (Natalie1103); exhaustively; energetically; consistently; fundamentally; in great detail (Taras); all the way through (VLZ_58); from top to bottom (VLZ_58); heavily (Abysslooker); intelligently; sound; sagaciously
Gruzovik	solidly
Игорь Миг	in earnest; competently
amer.	from the ground up
amer., Makarov.	good and hard
bank.	in underlying fundamentals (akimboesenko)
dial., amer.	tight
fr.	a fond
idiom.	to the core (VLZ_58)
inf.	properly; neck and crop (Andrey Truhachev); top to bottom (VLZ_58); majorly (VLZ_58); bigly (Val_Ships)
Makarov.	good and proper; substantially
math.	fully
scottish	lockfast
slang	slam-bang
основательнее adj.
gen.	fully (ssn); better
Russian thesaurus
основательно adv.
gen.	éреусе

основательный: 156 phrases in 29 subjects

Advertising	2
American usage, not spelling	2
Banking	1
British usage, not spelling	2
Business	2
Caspian	1
Diplomacy	1
Education	2
Employment	1
General	74
Human resources	1
Humorous / Jocular	1
Idiomatic	4
Informal	3
Law	3
Makarov	33
Management	1
Mathematics	1
Medical	1
Mining	4
Obsolete / dated	1
Philosophy	1
Politics	1
Programming	1
Religion	1
Research and development	1
Rhetoric	3
Scientific	2
Slang	5