One possible synonym for the word "phewed" is "exhausted," which conveys a sense of extreme weariness or fatigue. Another similar word is "weary," which suggests a prolonged or chronic state of tiredness that can lead to feelings of apathy or disinterest. Other possible synonyms might include "spent," "drained," "depleted," "fatigued," and "worn out." Each of these words connotes a feeling of physical or emotional exhaustion, suggesting that the person is unable to continue with their current task or activity without taking a break or resting for a period of time.