th

𓍿 þ
ð
δ
θ Θ

noun suffix ⋍ tion
slow ⇨ sloth

From Middle English -th, -t, from Old English -þ, -t, -þu, -tu, -þo, -to “-th”, abstract nominal suffix), from Proto-Germanic *-iþō, from Proto-Indo-European *-iteh₂. Cognate with Scots -th, West Frisian -te, Dutch -te, Danish -de, Swedish -d, Icelandic -ð, -d, Gothic -𐌹𐌸𐌰 (-iþa), Latin -itās “-ty, -ity”. See -ity, -t.

(no longer productive) Used to form nouns from verbs of action.  
    berth, birth, blowth, drawth, flowth, growth, sight, spilth, stealth, theft, weight  

(no longer productive) Used to form nouns from adjectives.  
    breadth, coolth, dampth, dearth, depth, filth, health, height/heighth, length, roomth, ruth, strength, troth, truth, sloth/slowth, warmth, wealth, width, wrath, wrength, youth/youngth