firmly established

Related

deep-seated · unwavering · steadfast · cemented · grounded · bedrock · immovable · settled · permanent · unshakeable · fixed · stable · secure · enduring · tradition · institution · foundation · pillars

Opposites
stability/permanence

firmly establishedunstable

Prone to sudden change

precarious · shaky · tenuous · insecure · unsteady

certainty/validation

firmly establishedunproven

Not yet established

unverified · disputed · contested · questionable · uncertain

novelty/development stage

firmly establishednascent

Beginning to develop

fledgling · emerging · embryonic · new · incipient

Familiarity
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