athāhu

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a+thāh, unfathomable, immeasurable, very deep; deep and profound, profoundly deep.

Grammar : adjective (of tū), nominative case; second person, masculine, singular.

Etymology : Old Panjabi/Gujarati/Maithili/Braj - athāh (very deep, unfordable); Sindhi - athāhu (bottomless); Apabhransh/Prakrit - atthāh; Sanskrit - asthāgh (अस्थाघ - very deep).