Rasarnavasudhakara 1.430

1.430

atha sukumāratā-
yad aniṣṭhura-varṇatvaṃ saukumāryaṃ tad ucyate ||

Now, delicacy [sukumāratā]:
That which consists of non-harsh phonemes is called delicacy [saukumārya].

1.430.p1

235ab

1.430.p2

yathā utphulla-gaṇḍa-yugam [ku. 3.4] udgata-manda-hāsam ity atra saṃyuktākṣara-sadbhāve' py aniṣṭhuratvāt saukumāryam |

As in “Both blossoming cheeks, [with] an emerging gentle smile” [Kumārasambhava 3.4], here, even though conjunct consonants are present, there is delicacy because they are non-harsh.