adjective

Severe or strict in manner or attitude.

he was an austere man, with a rigidly puritanical outlook

severe,stern,strict,harsh,unfeeling,stony,steely,flinty,dour,grim,cold,frosty,frigid,icy,chilly,unemotional,unfriendly,formal,stiff,stuffy,reserved,remote,distant,aloof,forbidding,mean-looking,grave,solemn,serious,unsmiling,unsympathetic,unforgiving,uncharitable