The antonyms for the phrase "called aloud" would be whisper, mumble, murmur, mutter, or speak softly. These words indicate a lower or quieter form of speech as opposed to calling out loudly. When we whisper or murmur, we often do so in a more intimate setting or when we do not want to disturb others. Mumbling and muttering may suggest a lack of clarity or confidence in one's speech, while speaking softly can convey gentleness or a desire to be discreet. Choosing the appropriate level of volume and tone when communicating is important for conveying our intentions and emotions effectively.