1) Bearing filaments 2) Filamentlike 3) Filiform 4) Long and thin 5) Resembling a thread 6) Thin 7) Thin in diameter 8) Threadlike 9) Thready Found on https://www.crosswordclues.com/clue/filamentous
Fil`a·men'tous adjective [ Confer French filamenteux .] Like a thread; consisting of threads or filaments. Gray. Found on http://www.encyclo.co.uk/webster/F/28