The Spanish word 'agusto' meaning 'comfortable' or 'at ease' comes from combining two elements: the preposition 'a' meaning 'to/at' and the noun 'gusto' meaning 'taste' or 'pleasure'. The word 'gusto' itself derives from Latin 'gustus' meaning 'taste'. The combination 'agusto' literally translates to something like 'to one's taste/pleasure', which evolved to mean 'comfortable' or 'at ease' in modern Spanish.

A simpler and more common Spanish word that shares this etymology is 'gusto' meaning 'taste' or 'pleasure'. You might hear this in common phrases like 'con gusto' (with pleasure) or 'me gusta' (I like it). While 'gusto' retained its original meaning related to taste and pleasure, when combined with 'a' to form 'agusto', it took on the more specific meaning of being comfortable or at ease.

The English word 'gusto' is related to the Spanish 'agusto', as it also comes from the Latin 'gustus'. In English, 'gusto' means 'enthusiastic and vigorous enjoyment', as in 'She tackled the project with gusto.' While both Spanish 'agusto' and English 'gusto' share the same Latin root meaning 'taste', they evolved to emphasize different aspects: comfort and ease in Spanish, and enthusiastic enjoyment in English.