all bark and no bite

English

all bark and no bite (not comparable)

(idiomatic) Full of big talk but lacking action, power, or substance; pretentious.
(idiomatic) Often making cutting remarks, but having a gentle personality underneath.
(idiomatic) Aggressive but never combative.

full of big talk

Catalan: moltes bufes i pocs trons, molta fressa i poca endreça
Chinese:
Cantonese: 光說不做／光说不做 (gwong¹ syut³ bat¹ zou⁶)

Mandarin: 乾打雷，不下雨／干打雷，不下雨, 光說不做／光说不做 (zh) (guāngshuōbùzuò)
Finnish: paljon porua, vähän villoja
French: grande gueule (fr)
German: große Klappe und nichts dahinter
Greek: όλο λόγια (ólo lógia)
Hebrew: כלב נובח אינו נושך (he) (a dog that barks, does not bite)
Indonesian: tong kosong nyaring bunyinya (id) (empty cans make the loudest noises)
Italian: tutto fumo e niente arrosto (all smoke and no roast)
Japanese: 張り子の虎 (はりこのとら, hariko no tora) (papier-mâché tiger)
Khmer: ឆ្កែព្រុសមិនដែលខាំ (chkaepruhmɨndaelkham)
Polish: krowa, która dużo ryczy, mało mleka daje (pl) (a cow that moos much, gives little milk)
Portuguese: cão que ladra não morde (pt), cão que late não morde (a dog that barks does not bite)
Russian: пуста́я бо́чка гро́мче греми́т (pustája bóčka grómče gremít) (empty barrel rattles louder)
Slovenian: peš, ki laja, ne griže
Spanish: mucho ruido y pocas nueces (much noise and few nuts), ladra pero no muerde, irse la fuerza por la boca
Swedish: stor i orden men liten på jorden

making cutting remarks, but having a gentle personality underneath

Chinese:
Mandarin: , 刀子嘴豆腐心 (zh) (dāozi zuǐ dòufu xīn)
Finnish: kova päältä, pehmeä sisältä
Greek: σκυλί που γαβγίζει δεν δαγκώνει (skylí pou gavgízei den dagkónei), σκύλος που γαβγίζει δεν δαγκώνει (skýlos pou gavgízei den dagkónei)
Italian: cane che abbaia non morde
Khmer: បានតែព្រុស (baantaepruh)
Russian: please add this translation if you can
Spanish: perro ladrador, poco mordedor