hesitation

Synonyms: averseness dawdling delay delaying demurral doubt dubiety equivocation faltering fluctuation fumbling hemming and hawing hesitancy indecision indecisiveness indisposition irresolution misgiving mistrust oscillation pause procrastination qualm reluctance scruple skepticism stammering stumbling stuttering unwillingness vacillation wavering

Antonyms: certainty eagerness go perseverance sureness