How many letters does the top answer for “in an inclined direction; obliquely; slopingly.” have?

The most common answer is slantly (7 letters).

Crossword clue: in an inclined direction; obliquely; slopingly.

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

slantly 7 letters web-def

degree of deviation from a horizontal plane

slantwise 9 letters web-def

at a slant; moving or directed in a slantwise position or direction