INFLECT
tone, inflect, modulate
(verb) vary the pitch of one’s speech
inflect
(verb) change the form of a word in accordance as required by the grammatical rules of the language
Source: WordNet® 3.1
Etymology
Verb
inflect (third-person singular simple present inflects, present participle inflecting, simple past and past participle inflected)
(transitive) To cause to curve inwards.
(transitive, music) To change the tone or pitch of the voice when speaking or singing.
(transitive, grammar) To vary the form of a word to express tense, gender, number, mood, etc.
(transitive) To influence in style.
Synonyms
• (to bend or curve inwards): inbend
Source: Wiktionary
In*flect", v. t. [imp. & p. p. Inflected; p. pr. & vb. n.
Inflecting.] Etym: [L. inflectere, inflexum; pref. in.- in + flectere
to bend. See Flexibl, and cf. Inflex.]
1. To turn from a direct line or course; to bend; to incline, to
deflect; to curve; to bow.
Are they [the rays of the sun] not reflected, refracted, and
inflected by one and the same principle Sir I. Newton.
2. (Gram.)
Definition: To vary, as a noun or a verb in its terminations; to decline,
as a noun or adjective, or to conjugate, as a verb.
3. To modulate, as the voice.
Source: Webster’s Unabridged Dictionary 1913 Edition