Rule reminder
Subtle distinctions: anche (neutral addition) vs persino (surprised inclusion); neanche/nemmeno (common, colloquial) vs neppure (formal); addirittura (shock, extremity) vs persino (surprise); mica (colloquial, personal tone) vs affatto (formal, neutral); proprio (precision/identity) vs davvero (sincerity/truth).
'Sono davvero stanco' vs 'Sono proprio stanco' — what is the nuance?