すぐ

• (Tokyo) す​ぐ [súꜜgù] (Atamadaka – [1])[1]
• IPA^(key): [sɨᵝɡɯ̟ᵝ]

Likely derived from root verb form sugu. The expected adjectival or adverbial form would be sugi, but there is evidence for sugu used in this way in ancient eastern dialects.[2]

Notably, the modern verbs 過ぎる (sugiru) and 挿げる (sugeru) derived from sugu (see further below) have shared underlying senses of “going through; directly; without stopping or turning”, indicative of this common root.

• 直ぐ, 直

すぐ (-na inflection, rōmaji sugu)

1. straight, not bent

すぐ (rōmaji sugu)

1. 直ぐ: immediately, right away, soon

   すぐ行 (い)くよ

   sugu iku yo

   I'll be there right away.

2. 直ぐ: quick to

   すぐ怒 (おこ)る

   sugu okoru

   quick to anger

3. 直ぐ: right next to, right close by

   すぐ上 (うえ)に

   sugu ue ni

   right on top

• (soon): そろそろ (sorosoro), 直 (じき) (jiki), 直 (じか) (jika), 直 (ただ)ち (tadachi)

• すぐに (sugu ni): immediately; directly
• すぐと (sugu to): immediately; directly
• 真 (ま)っ直 (す)ぐ (massugu): straight; straightforward, honest

• 今 (いま) (ima): now

The reading of various kanji terms.

すぐ (rōmaji sugu)

1. (obsolete) 過ぐ: classical form of modern 過ぎる (sugiru, “to go through, to go past; to exceed”)
2. (obsolete) 挿ぐ: classical form of modern 挿げる (sugeru, “to connect or affix one thing to another, especially by passing something through something else”)

すぐ (romaji sugu)

1. 直ぐ: immediately