weightiest
Of greatest gravity
Weightiest is the superlative of weighty—the heaviest or most significant of a group.
Physical weight applies: the weightiest package in the shipment.
More often the sense is figurative, describing matters of great importance or consequence: the weightiest decisions of his presidency, the weightiest arguments against the proposal.
Most serious or critical
- paramountOf supreme significance
- crucialOf supreme importance
- pivotalVitally important, deciding
- decisiveQuick to conclude
fundamental · commanding · dominant · powerful · formidable
Having greatest mass
- loadCarried weight or burden
- encumbranceHindrance or legal claim
- obligationRequired task or commitment
- responsibilityState of being answerable
onus · millstone · albatross · yoke · oppression · hardship · affliction · cross
gravest
Most serious or critical
decisive · fundamental · commanding · dominant · powerful · formidable
heaviest
Having greatest mass
- loadCarried weight or burden
- encumbranceHindrance or legal claim
- obligationRequired task or commitment
responsibility · onus · millstone · albatross · yoke · oppression · hardship · affliction · cross · liability
heaviest
Having greatest mass
gravest
Most serious or critical