What does "tenuous steps" mean in "... took his first tenuous steps down the corridors ..."?
In which situations can I use the word tenuous? (It has so many meanings...) Can you give me some examples? Thank you!

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Here are some examples:  having thin consistency; "a tenuous fluid" 
flimsy: lacking substance or significance; "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame"
Doubt, a status between belief and , involves uncertainty or distrust or lack of sureness of an alleged fact, an action, a motive, or a decision. ...

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His first steps were not strong or confident.  Maybe he was sick or wounded.  You could use this for a baby's first steps as well.