Any process that stops, prevents, or reduces the frequency, rate or extent of T-helper 1 cell differentiation.
Comment:
Note that immunologists typically use the word 'development' to refer to cells of B or T cell lineages undergoing the process that GO describes as 'cell differentiation'.
Synonyms:
exact_synonym:
down regulation of T-helper 1 cell differentiation; downregulation of T-helper 1 cell differentiation
narrow_synonym:
inhibition of T-helper 1 cell differentiation
related_synonym:
negative regulation of T-helper 1 cell development