No, it's not. You should say: ''Something is not worth considering''. After the word 'worth' you have to use verb+ing, for example in these sentences: 'It's not worth watching this movie. It's boring!' or 'This movie is not worth watching'. It's kind of boring! hope you understood it! ( you wondered whether the sentence was right or not, so it was worth explaining it to you!)

No, it's not. You should say "Something is not worth considering" https://www.google.com/#hl=en&sugexp=les%3Beqn%2Ccconf%3D1.2%2Cmin_length%3D2%2Crate_low%3D0.035%2Crate_high%3D0.035%2Csecond_pass%3Dfalse%2Cnum_suggestions%3D2%2Cignore_bad_origquery%3Dtrue%2Conetoken%3Dfalse&gs_rn=0&gs_ri=hp-qn&dc=is%20&tok=tKSFmKBG3wK834tRAchI2g&pq=is%20not%20worth%20considering&cp=0&gs_id=49&xhr=t&q=not+worth+considering&es_nrs=true&pf=p&tbo=d&sclient=psy-ab&oq=not+worth+considering&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.41524429,d.Yms&fp=2133deba519e1bd2&biw=1366&bih=643&bs=1